Ooh these are awesome, Maria! I think you've got a really good understanding of light and shadow.

Critique-wise, I'd say to give extra attention to proportion.
The upper arm in the first picture seems a bit thin, as well as the way the shoulder is drawn, makes it look a bit disjointed.
The thighs on the second also look a bit thin.
The forearm in the third picture appears short though it could be the hair disrupting the flow and making it look that way.
All depends on what you're going for though! I'd say producing results like this after a long hiatus is something to be impressed by regardless!