I love the feeling this picture has. He is singing his heart out. You can just feel him inhale as he looks as he has a lot of air. I like the frets on the guitar and how they run off the image. The keys are interestingly placed and provide more feeling in the picture than realism. One thing I would not have noticed before I started to draw this was that there is a little bird, it looks like a parot, that comes to get the flower out of his hat.
I used markers for this and it was kinda a new experience using them on this hemp paper. They kinda ran or wouldn't get a medium color that I wanted. What I learned? Just keep drawing and keep having fun. Experiment. Let go of expectation and learn from the markers what they have to tell you about themselves.