I can see that overall, your use of additional masses has improved a fair bit in most cases, though there still are some (like along the shark) where you're drawing the sides that touch the existing structure as outward curves, which does not create a relationship between them. Inward curves in this case, as you've used them elsewhere, do a much better job of "gripping" onto the existing structure.

As to the animals with their eyes on the side of their heads, [here's a demo]() (they're never quick). I noticed that when tackling the rhino, you went back to having the eye socket just floating loosely on the head structure, and you likely had difficulty less because of the eyes being on the side of the head, and more because the rhino's head is more elongated, making it difficult to just start the cranial ball on one end, and extend in a single direction. So, I found the most banana-headed rhino I could find, and based my demo on that.

Now, this is an area you still need to work on, but I'm not going to hold you back on its account. Just keep practicing the specific use of those techniques, and remember above all else that your goal here is not to copy the reference. If you're stuck between a choice of applying the technique and having it come out differently, vs. abandoning the technique and following the reference, follow the technique. Each drawing is at the end of the day just a puzzle, as you can see in the rhino head demo I made for you. We start with the same core elements, and we gradually build upon them through the addition of simple forms, defining their relationships with the existing structure and continually moving in the direction defined by our reference. We may not get to that specific goal itself, but we want to continually move in that direction, studying it closely to identify the specific nature of each new piece we wish to build out.

It's this process of solving the puzzle that allows our brain to practice, again and again, the act of manipulating forms and understanding the relationships between those forms, in 3D space.

Anyway, I'll go ahead and mark this lesson as complete.