Don't do many commissions, and haven't done any in ages. I do have some free requests lined up though.
Regular Size: 300dpi and usually at least 10x10 inches, but usually at least 20 inches wide if I want to get them printed. Commission Size: The same as Regular. Free Requests: Vary. If I did them to try to improve something (in other words redraw it a million times until it's right) they're usually smaller and not very printable because I don't care to print them. 300dpi 4x5 inches. If I did them because I was bored and really liked the idea, I might make them bigger so I can print them.