Image Size Recommendation Needed

Hi guys!
I am a photographer/visual artist trying to build my own WordPress responsive website. What image sizes should I create for each of my artistic pieces that would then be viewable from a desktop to mobile devices and the new retina displays for the iPad? Is there some doc here I can read?

Thanks again for whatever help anyone can give me.

—jerry

Well the issue is discussed pretty much everywhere else already if you were to search for it.

Here’s one.

Smashing Magazine - Towards A Retina Web
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Are are you talking about designing for particular device display sizes, ie 320x240 vs iPhone / iPad sizes?