Looking good! Some of the light lines on the second image get a little lost, but I sorta like that. Very clean. Good work!

Nice explorations-- I especially love the poses in the last page, they have lots of personality!

I definitely understand that urge! Drawing is fun and the act of whittling away at a piece can be its own reward sometimes. Your line quality feels pretty good in most places and you don't seem to be having too hard of a time with massive erasing and replacing areas. But don't be afraid to acknowledge where some parts aren't right, either. Looking at the penguin's outer arm, it's lower than the other. Depending on the purpose of your drawing, proportion and placement may come second to designing. The same goes for the hand here. You did GREAT job on the middle two fingers. They feel pinched and appropriately curved. Those fingers come to some sharp points, though. If you end up choosing to design shapes in this way on purpose, having the thumb and pinky be pointy while the index comes to a box tip would make them all flow a little bit more.

Lovely!

This is really nice. Especially for your first attempt! The shapes and values are thoughtful and well placed. I would maybe darken the lighter value in the cast shadow shape. But that’s all I notice. good work!