I doubt many that follow this account HAVEN'T already seen FAPP, but, if ya haven't, check it out.

http://www.furaffinity.net/journal/8109986/

It's like simplified d&d but for lewd.

I've been doing them for a while for myself on f-list and such.

Check the Commission Info page.

Price will depend on image size/work needed for image completion. Several examples shown.