For WWE pictures the best source would obviously be WWE.com. To get pictures off WWE.com use the Printsceen key on your keyboard as you can't right click with their new layout. The printsceen (PrtSc) key should be to the right of your F12 key or somewhere around there. Other than that using google is never a terrible idea.
As for psds my favourite site is
http://www.italianpsd.net/ you have to register but that is pretty easy.