The organic forms don't wrap around enough making them feel like just lines running across the form. The texture is very well done, I don't really know how to critique it because I haven't grasped it as well as you did there. I would say you're main priority is more confident lines because all the exercises have some wobbly line work. I would suggest doing the 1 page of the organic forms using more curved lines and 1 page of the form intersections. Try and really focus on the line work even if the lines are over or undershot.