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Ok, j'ai trouvé !  

Pour ceux qui en auraient besoin, voilà ce que j'ai fait pour obtenir le résultat recherché :

$products = $params['order']->getProducts();
		$customized_datas = Product::getAllCustomizedDatas((int)$params['cart']->id);
		Product::addCustomizationPrice($products, $customized_datas);
		foreach ($products as $key => $product)
		{
			$unit_price = Product::getTaxCalculationMethod($customer->id) == PS_TAX_EXC ? $product['product_price'] : $product['product_price_wt'];

			$customization_text = '';
			if (isset($customized_datas[$product['product_id']][$product['product_attribute_id']]))
			{
				foreach ($customized_datas[$product['product_id']][$product['product_attribute_id']][$order->id_address_delivery] as $customization)
				{
					if (isset($customization['datas'][Product::CUSTOMIZE_TEXTFIELD]))
						foreach ($customization['datas'][Product::CUSTOMIZE_TEXTFIELD] as $text)
							$customization_text .= $text['name'].': '.$text['value'].'<br />';

					if (isset($customization['datas'][Product::CUSTOMIZE_FILE]))
						$customization_text .= count($customization['datas'][Product::CUSTOMIZE_FILE]).' '.$this->l('image(s)').'<br />';

					$customization_text .= '---<br />';
				}
				if (method_exists('Tools', 'rtrimString'))
					$customization_text = Tools::rtrimString($customization_text, '---<br />');
				else
					$customization_text = preg_replace('/---<br \/>$/', '', $customization_text);
			}

			$url = $context->link->getProductLink($product['product_id']);
			
			$myprod = new Product($product['id_product']);
			$features = $myprod->getFrontFeatures(1);
			foreach ($features as $feature)
			{
				foreach ($feature as $key => $value)
				{
					if($value == "Label")
					{
						$label = $feature['value'];
					}
					if($value == "Artiste")
					{
						$artiste = $feature['value'];
					}
				}
			}
			
			

			$items_table .=
				'<tr style="background-color:'.($key % 2 ? '#DDE2E6' : '#EBECEE').';">
					<td style="padding:0.6em 0.4em;">'.$product['product_reference'].'</td>
					<td style="padding:0.6em 0.4em;">
						'.$artiste.' - <strong><a href="'.$url.'">'.$product['product_name'].'</a>'
							.(isset($product['attributes_small']) ? ' '.$product['attributes_small'] : '')
							.(!empty($customization_text) ? '<br />'.$customization_text : '')
						.'</strong> ('.$label.')
					</td>
					<td style="padding:0.6em 0.4em; text-align:right;">'.Tools::displayPrice($unit_price, $currency, false).'</td>
					<td style="padding:0.6em 0.4em; text-align:center;">'.(int)$product['product_quantity'].'</td>
					<td style="padding:0.6em 0.4em; text-align:right;">'
						.Tools::displayPrice(($unit_price * $product['product_quantity']), $currency, false)
					.'</td>
				</tr>';
		}

Merci @Eolia pour ton aide !

Bon, je commence à baisser les bras.

Est-ce que tu pourrais s'il-te-plaît jeter un oeil et me dire ce que je fais mal ? (au moins je n'ai plus d'erreur 500, youhou !)

Merci beaucoup d'avance !

foreach ($products as $key => $product)
		{
			$unit_price = Product::getTaxCalculationMethod($customer->id) == PS_TAX_EXC ? $product['product_price'] : $product['product_price_wt'];

			$customization_text = '';
			if (isset($customized_datas[$product['product_id']][$product['product_attribute_id']]))
			{
				foreach ($customized_datas[$product['product_id']][$product['product_attribute_id']][$order->id_address_delivery] as $customization)
				{
					if (isset($customization['datas'][Product::CUSTOMIZE_TEXTFIELD]))
						foreach ($customization['datas'][Product::CUSTOMIZE_TEXTFIELD] as $text)
							$customization_text .= $text['name'].': '.$text['value'].'<br />';

					if (isset($customization['datas'][Product::CUSTOMIZE_FILE]))
						$customization_text .= count($customization['datas'][Product::CUSTOMIZE_FILE]).' '.$this->l('image(s)').'<br />';

					$customization_text .= '---<br />';
				}
				if (method_exists('Tools', 'rtrimString'))
					$customization_text = Tools::rtrimString($customization_text, '---<br />');
				else
					$customization_text = preg_replace('/---<br \/>$/', '', $customization_text);
			}

			$url = $context->link->getProductLink($product['product_id']);
			
			foreach($product['features'] as $feature) {
				if($feature['id_feature'] == '11')
					$product['product_artist'] = 'Artiste';
				if ($feature['id_feature'] == '10')
					$product['product_label'] = 'Label';
				}
			
			$items_table .=
				'<tr style="background-color:'.($key % 2 ? '#DDE2E6' : '#EBECEE').';">
					<td style="padding:0.6em 0.4em;">'.$product['product_reference'].'</td>
					<td style="padding:0.6em 0.4em;">
						'.$product['product_artist'].' <strong><a href="'.$url.'">'.$product['product_name'].'</a>'
							.(isset($product['attributes_small']) ? ' '.$product['attributes_small'] : '')
							.(!empty($customization_text) ? '<br />'.$customization_text : '')
						.'</strong> ( de '.$product['product_label'].')
					</td>
					<td style="padding:0.6em 0.4em; text-align:right;">'.Tools::displayPrice($unit_price, $currency, false).'</td>
					<td style="padding:0.6em 0.4em; text-align:center;">'.(int)$product['product_quantity'].'</td>
					<td style="padding:0.6em 0.4em; text-align:right;">'
						.Tools::displayPrice(($unit_price * $product['product_quantity']), $currency, false)
					.'</td>
				</tr>';
		}