I usually turn them down too. Don't want to be mean about it, but if they're not willing to help me out and/or expect me to go out of my way to find the material myself, then theres less incentive to want to draw for them...for FREE. Alot of people seem to forget that its free, and that with a freebie comes attached at least some responsibility and consideration for the artist. This whole issue becomes even more clear when someone is in the right to be charging for their work, like myself. I'm at a point where I can only afford to be spending my time on commissions for people who want my quality work. To do anything for free (for anyone but close friends or through kiribans, contests, etc.), at my current level, would be taking up a large portion of my time. We're not talking doodles and sketches here, but portrait-quality stuff. So, yes, if I was to do draw quality stuff for free to begin with, the requester should definitely be more considerate of me, my time, and my resources. Otherwise, they're just monopolizing my time...time that could have been put to use working on something that would actually be making me money or furthering my artistic endeavors.