/ic/ - Artwork/Critique

Started out today. Doing the Stravinsky exercise from the sticky, bit I'll call it a day now, I can barely focus and need to sleep now.
Though I already feel like I fucked myself over a bit, the little inaccuracies pile up and make the whole picture look deformed. I know it's no wonder since it's my first time and all, but it's still a little frustrating.
Where should I go next? I was thinking of picking up "Drawing with the right side of your brain" and see where that'll get me.