images should be the size it came out of the camera. no larger.
size in megabytes is 25, save it at a level 12 if you can, only drop it if you have to. the dimensions in this case makes no difference.
always shoot in raw. you get more data in raw. however raw is only good if you plan to edit your images. and you should, if you bought a full frame camera. raw lets you save images that had white out skies and things in the shadow. it gives you control over white balance and such.
i try to sign all my work. keep it away from the edges, don't use block letters, i fade mine because of the chopping off on products.
all the prices increase as they get larger and they should. in order for the large ones to print, the image has to be perfect at a 100%. that extra work is worth more money.
all my prices are the same picture wise. i change my prices now and then, using bulk. i can't chase prices all over the place. its fine if you have 5 images, but i'm getting close to 3000 now, and well no.
be sure to add descriptions to the work, they are actually pretty important.
---Mike Savad
MikeSavad.com