These are awesome. Love the exaggerated proportions. These little guys have so much character to start with, it's hard to tell which ones are the studies. ;) Would be fun to push the shapes further away from their natural shapes. Great work.

Looks nice overall. Remember to use nice loose confident strokes and just work on capturing the rhythms of the forms. Think long flowing strokes from your arm and shoulder and not your fingers.

Finished her up. More like an hour for this one. I do find myself worrying about how accurate my drawings are and not letting go of the proportions and accuracy enough. I am going to give the drawing from imagination project a go and see what happens.

I love these. Nice energy in these sketches. How long did these take?

These are actually nice gestural lines. It's just the relation between lines that you're missing. You could try mapping things out more slowly and keeping an eye on how each line relates to others you put down. Overall though, these are nice loose lines, they just need to be reined in a bit.

These look nice. Have you watched Stan's boot demo? He shows a nice way to get your general layout started so that your subject fits nicely on your page. Kind of an oversimplified bounding box shape to start and then work into more and more detail.