If you go to your local Barnes & Nobles, and look near the art section, they usually have a bunch of clip-art books on a rack. They're like $20 a book, and there are ones called Fantasy, Dragons & Wizards, Gnomes & Faeries, and a few others. They usually have about 150 pictures in each book. You might be able to find some portrait-type images in there. They're black and white line drawings, so you can color them however you want. Keep in mind that you can only use 10 from each book in any given publication, though.
Also, in my little game Armand and the Foppish Hat, I used some tiles from molotov.nu, the Lorestrome Pixel Archive, and a few others.
Also, in my little game Armand and the Foppish Hat, I used some tiles from molotov.nu, the Lorestrome Pixel Archive, and a few others.