SciFi and Fantasy Art: Sea Siren -- WiP

I drew this as a body study, from a swimsuit calender that i found (my husband and i went to look at a house we were thinking of renting, and the last resident had left it in the garage, so i took it). Swimsuit magazines and lingerie catalogues arew the best places for reference images of the female body (i swear i'm not a pervert!) ;i) She's a siren (i was thinking of making her a mermaid, but i'd spent so long on her legs i didn't want to erase them). The model in the picture was reclining on the hull and railing of a boat, but i plan on drawing some rocks under her, i think.

Ref image: A picture in the 2002 Sports Illustrated Swimsuit Calender.
Meduim: Graphite Pencil.
Size: 8 x 5 in.
Date: Current (WiP)