I read your profile and see you are interested in music also. You have a very good eye. I'm glad you are taking an interest in mark making. In all arts there are formal elements. Rhythm, tempo, texture, composition, line, form, value and color. Along with these goes content, subject, materials or medium and expression. I often listen to music as a way to help me with keeping rhythm, point-counterpoint , etc. Use your background in music for a way to organize and express those same things you express in your music. Catching a likeness is a skill and trying to depict someone character is trickier and embedding your self too takes this formal language. So to that end I would suggest playing with your tools and marking making - brush work become a scientist and adliber. Work like you are still a musician. Cut loose trying to draw a subject, learn to express like you do in music. Every stroke has a feeling which adds to the others organizing just as notes do. Your smaller marks in this are not supporting your subject they are looser, but don't bring the harmony, tempo, silences needed to move this pieces somewhere. Either you are not sure where you want to go with it or don't know where to go. You still need to have a language to approach it. This is the most important and rewarding part of doing artwork. It is also the most vulnerable part. Hey nothing ventured nothing gained. I have always found inspiration from music, dance and all things in life to further my art along. Setting problems to solve is a good way to discover visual language solutions also. Bonvoyage have a wonderful adventure send pics!