Nice work! There's definitely a lot of growth and improvement here, and you're clearly taking better steps towards applying the principles of the lesson.

I've got a few points I've marked out here on your fox drawing:

• When adding additional masses, avoid sharp corners. Think of them like slabs of meat that you're adding to the form. Meat doesn't have sharp corners - it'll bend and wrap around, but won't feature such sudden turns.

• You're doing a great job of working in additional forms into your construction, but keep working on identifying others that exist along the body.

• You don't seem to be blocking in a full sphere for the eyeball itself - it helps when actually constructing the eyelids, since the eyelids wrap around it in 3D space.

Additionally, keep working on your observational skills. Your construction as a whole is coming along nicely, but I think proportions (which comes down to analysis/studying your reference) still have a ways to go. Your fox's body ended up looking a fair bit more like a big cat like a cougar or a lion.

Anyway, I'll go ahead and mark this lesson as complete. Keep up the good work.