The overall result is truly beautiful and inspiring. You show a great eye for textures and details. The feeling is quite sexy and scary at the same time. You have a great talent and I encourage you to never stop practicing.
The only real thing that makes my eye shift slightly is the tiny girl between the taller one's legs. The legs of the adult should be more apart, or open if you will... and her right leg would be a bit smaller since it would be a little further away. You could seek out references or women at the beach (always a good start, and never dull). Legs even squeezed together are rarely the same height since perspective already comes into play.
That said, never forget how amazing your talent is and never give up. Ever. I hope these small advices don't put you down (they shouldn't... they should motivate you quite a lot)
wait, what blade? O.o this is great! And am I imagining this or is one female tinier than the other (different species perhaps?) looks like the bigger one is illuminating the feeling of safe and security onto the small girl. She's her mother perhaps?