I've always gotten a Ralph Bakshi vibe from your character design. It's all the stronger in color; some of these pictures look almost like animation cells! Part of it is your excellent sense of captured motion... nice flinch on the part of the blonde in the first picture!
Love the curves, and the colors, but it's the expressions that really make these so compelling! That look on the redheads face as she possessively brushes the blondes hair back... it's going to be a long night.