Practicing some head construction.

love the action in the first pose. Looks like you have good construction.

whoa! This is beautiful! My personal take would be to add in some more detail for the shoulders and just fill out that part of the body since you already have the neck and partial chest in there. Pretty much what everyone else said. :)

I think they look great and agree with everyone else's post of shortening your time down and just focus on certain aspects of the drawing rather than completion. We are all here to practice and get better after all. Just keep building off the knowledge you're gaining. They look great!