Some sort of DnD Monster (Monster Manual has a great listing of ideas there)
Video game concept art can prove to be a great source of inspiration (Either looking at artwork other's have done or coming up with your own)
Maybe room designs and furniture designs if you're wanting to work on perspective and the like.
Otherwise, could always go with Fanart or random OCs from shows you're watching right now :P
Link
Fyger
Some sort of DnD Monster (Monster Manual has a great listing of ideas there)
Video game concept art can prove to be a great source of inspiration (Either looking at artwork other's have done or coming up with your own)
Maybe room designs and furniture designs if you're wanting to work on perspective and the like.
Otherwise, could always go with Fanart or random OCs from shows you're watching right now :P