I don't have PSP, but photoreal textures are usually from pictures you take yourself or find on the net.
When you get the pics, and if you got shots of most of the important parts (tail and such) just paste them and later fit it to the part (tail to tail for example). Since you probably can't can't find top and down shots, you gonna have to make this by yourself, using regular paints or taking parts of pics that are in the same colors as you need and work it out on PSP.
as you can see here, a good painting job can create an "almost photoreal" textures. I didn't used pics there:
http://www.simviation.com/cgi-bin/yabb/ ... 1044514909good luck