First off, good job completing lesson 2! Your boxes looked really good as far as I can see. As for some things to look out for here are some of the things I noticed:

1. The most noticable thing I saw right off the bat was the arrows. The excercise is supposed to make you more comfortable with perspective regarding organic objects. Don't be afraid to overexaggerate the width of the parts where the front and back overlap. The further away the back part of the arrow is, the more "movement" or loops there will be. This is simply because objects that are further away from you appear closer to eachother. 

2. Your textures looked really good except for one thing: the shadow of the silhoutte. A way you can make sure your textures really pop is to add more shadow to the silhoutte, and less to the parts that are closer to the viewer. Think back to the texture study exercise where you essentially create a grey sclale for your textures, just wrapping around the texture itself.

3. The last thing I noticed is your organic sausage forms for the organic intersections excercise. when you draw the base sausage that form that the others will be resting on, you should make sure that the form is also formed with the thought in mind that it's curving, and that the ends of it have width just like the others instead of pinching at the ends. 

Other than that, your form intersections looked really good, and so did everything else. I think you should do the dissections exercise again using the method I mentioned, but only 1 page should be enough.