I hope I can take this to homage to my friend and art master Dean Yeagle!
Thanks again for Dean, he gave the following comments to me :)
So for a critique - well, you just draw quite differently from me, so her body shape is very much heavier from the waist down, and her muscles and bones more apparent. And her face is rounder, with larger features overall. Your style reminds me of Alberto Ruiz.
Terrific 'caricature' of Mandy - thanks very much! As for your other caricatures, if you're just learning, you're learning very fast! They're just great.