Organic arrows: they're a little short, but that's no big deal. Also, I think you didn't understood the meaning of the shadow: the shadow is supposed to be behind the fold, look at examples here.

Organic shapes are good, but be sure they've got the same thickness on the whole long.

Texture analysis: you were supposed to start with crumbled paper, take your time to read the instructions! The two first are good, and the third one would be great if you didn't put vertical lines, which didn't correspond to any cast shadows. Keep in mind not to apply a repetitive pattern of what you think it is, but what you see, in this cas more like little bumps. Hatching is not what it's asked for.

Dissection: textures are mostly good, but don't forgot to wrap your textures around the form it suits (like your leaf texture for example). Also, your sausages in this exercise are really worse than from the past one. Keep the lines flowing, and make a consistent, same thickness sausage.

Your organic intersection is pretty good. However, don't overshadow: don't forgot that casts shadows are the ones your supposed to focus the most on. So, make them wrap the form who's above, but don't make to much.

For your forms intersection, don't make small groups of forms. Also, I suggest you to be more vigilant to the perspective of your basic 3D shapes, like boxes. Some of them are strange and not boxy.

So, it's a good job, but with some small mistakes which can easily be fixed.