Hello there. Since I'm a designer that workout with a lot of internet marketer, so I know how important graphic elements in Facebook Advertising. The images that we use in create sales copy in Facebook more important than copywriting! Yes, it's true. Based on research, Facebook user behaviour are very attractive to a interesting pictures. And based on my experience, Facebook Ads that's using the pictures of girls or baby got a very high click-through-rate (CTR). So, pictures are really important in Facebook advertising. It's is a key whether you ads will succeed or not. BUT, not many marketers know the best pictures size or format that they need to use. I always refer this Facebook Page size & dimension: https://www.facebook.com/PagesSizesDimensions If you don't follow the size & dimension that's Facebook already set than your pictures will be display in very poor quality. It will make your pictures less attractive and overall your ads will failed. The best format for the images that we use in Facebook is .png. It will give you very sharp pictures display. Hey, let's share your experience and knowledge in this thread regarding images & pictures in Facebook. Cheers! P.S: BTW, if you need any advice on choosing the right images or pictures for Facebook Ads... just feel free to inbox me. I'm also offer banner design services as well.