Some advice ?

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Here's another drawing I made. A friend of mine asked me to make a drawing for her of a dreamcatcher. At first she gave me 2 pictures and told me if I could make the 2 of em in 1. After a while I kept asking what she really mean by that? Cuz I had to change it everytime but then I thought owh nice she needs it so maybe I'll get payed for it. Cuz most drawings I make are request from people. I worked hard on them and don't earn anything. Do you maybe have an idea on how to sell my drawings? Or I should practice a little more