I'm doing Marc's course so don't mind me, I'll critique only what I've been made apt with so you don't have to listen plus this is a pretty late reply (someone more experienced gave you feedback any how) ^^
First image I love the colors and values; the subtle linework in the background gives me a very peaceful/relaxed feeling, combined with the wide use of spacing. I can easy tell of the weight of the individual's expression and presence as the focus, and the light shining in compliments to the character's overall volume ^^
The second I'm drawn particularly to the face and, nicely enough, the blue shoulder pieces; the patterns in them are lovely, as they are on the gold—the values on them draw me in a fair amount, in-fact.
For the third, I like the sense of scale, though would have made the character slightly smaller, or lessened the values on the moon(?) and sun behind her. Her head piece purely for the patterns and the apparent texture of the clothing I'm enjoying a lot, I found myself drawn to her eyes the most.
I do feel with the third one as mentioned the color values feel a little overpowering both, other than that, I enjoyed it!