That’s all right! A flat-colored portrait is just 10, 15 with shading, at present. I will be re-evaluating my prices soon though, with some increases - but I don’t see myself charging much more for something of that nature.
I’m glad you like my artwork, but I do not to art for free. I think it’s fairly clear on my tumblr that I am a professional illustrator who regularly does commissions. Working for zilch would not only be unfair to my paying customers, but a disservice to the time, effort, and other significant investments I put into getting myself to the point I am now. In the future, please do not go around begging for artwork. If you truly enjoy an artist’s work, afford them the same courtesy you would a person who performs any other service - I don’t think you’d ask a plumber to do some work for free just because you thought he did a really great job with your friend’s sink, would you?