Picture of the products is a part of the search engine optimization strategy therefore you must focus on it. The pictures of products are necessary to give in a website because it helps in the explanation of the product. But if the pictures would be unsuitable the image of the website will be decrease. In this way you should give name to the particular model number with descriptive tag according to the search engine optimization. Give specific heading to each picture, never give numbers to the pictures it is not according to the search engine optimization tactics.  Suitable pictures are compulsory part of a web page.  Products with picture detail enhance the beauty of your web page therefore you must concentrate it.