Starting with your organic intersections, these are coming along fairly well. You're doing a good job of establishing how the forms pile upon one another, slumping and sagging under the forces of gravity. Your application of cast shadows is definitely coming along nicely - you're doing a good job of pushing forward boldly, and keeping that consistent light source in mind. There's just one thing to call out - you're not drawing through the ellipses at the tips of your sausage forms two full times before lifting your pen, which is something we do for all the ellipses we draw throughout this course, as discussed back in Lesson 1.

Moving onto your animal constructions, I really feel that overall you've done a great job of focusing on each of these drawings specifically as an exercise in spatial reasoning. You've clearly paid a lot of attention to how it's all about thinking through the way in which these forms fit together in three dimensions, and the heavy use of additional masses, wrapping them around the existing structures and really designing their silhouettes to convey those spatial relationships demonstrates this well.

I do have a few suggestions, but overall you've done a great job. I'll do my best to keep these points brief, so they're more easily digestible:

• I didn't see you making this mistake much at all, but I figured I'd just call this out - don't cut into the silhouette of your forms, as you did here. When our ellipses get rather loose, always pick the outermost perimeter as defining the silhouette of that form, just so all of its linework exists inside that space, rather than floating outside of it.

• When adding smaller bumps along the animal's spine, remember that the torso itself still has a broader "top" plane to it. On this deer fawn, the way you added the bumps right at the edge somewhat negated the impression of a broader plane there, so be sure to have those masses droop/wrap around more along the sides.

• One thing I really liked on your first bunny drawing was that you were paying a lot of attention to how things fit together. You blocked out the big mass along the bunny's shoulder, and then wrapped one of your additional masses around its edge here, fitting them together like pieces of a puzzle. That's excellent, and I'd love to see more of that on your other drawings - like this. Those big shoulder and hip masses are a gold mine for this sort of thing, and while they're not easy to spot, they are always present in one form or another simply because quadrupedal animals need a lot of muscle in that area to help them walk and run.

• Your head constructions are coming along really nicely, and you're doing a great job of applying the principles in this demo - that is, fitting everything together like a puzzle. One thing that can also help, specifically when dealing with eyes, is to draw the eyelids themselves as their own separate additional masses (one for the upper lid and another for the lower lid). This can help us better focus on how they're actually wrapping around the eyeball itself, as shown here, much moreso than trying to draw a single "eye" shape and having that conform to the eyeball's curvature.

Aside from that, you're doing really well, and are developing in the right direction. You'll still improve with plenty more practice, but what I'm looking for at this point is the direction in which you're traveling, and the understanding you demonstrate with your work. I'll go ahead and mark this lesson as complete, so keep up the good work.