Because this has come up a bit recently. Let me explain a thing.
Sometimes I draw things in my leisure time that I feel like drawing I post those drawings on here or on my tumblr. Those are things I want to draw or have the urge to draw at that moment. Those are things I do for fun.
If someone requests a drawing, it is no longer leisure time. It is then work time. I get paid for my work time.
DO NOT leave a comment or send me a note asking that I do a piece for you and expect it to be free! I have gotten a TON of these recently and as soon as I bring up money, I never hear from the people again. Doesn't hurt my feelings that they stop talking to me, but it ticks me off that they presume that I'll spend my time and energy on their thing for free. That's not how I work. It SHOULDN'T be how ANYONE works!