Here is my attempt, that's the one I struggle the most with. I feel like it's harder for me right now to eyeball proportions.

OKAY, so the snail still destroyed me when it came to problem solving proportions. It looks fine after some measurements and some "I feel like this line should be this long". Simplifying the body of the snail was the most difficult part.

This was tough. One of the hardest parts was just trying to find someone to study, so I ended up picking from the shortlist, and went with David Malan. I like his style. This is just my interpretation, but I feel the variety in the types of lines he uses is subtle but expressive, and his hatching has a directional quality to it that draws the eye in. While some of his hatching/shading seems loose and relaxed, having tried to emulate it, I learned quickly the amount of control and skill in actually producing those lines. Mine involved a lot of erasing and redoing, getting trapped in my perfectionist mentality so the lines constantly felt stiff and awkward. I also struggled with some of the line weights. I used a 0.5mm mechanical pencil like he uses, but had to switch to a regular graphite pencil to get some of the lighter, softer lines.