try using basic shapes like circles and tubes for the body to get the proportion a bit accurate .... then add the added flesh in it for the curves .... while looking at your reference ....
It's okay the artist wants some feedback and I did compliment him on the way he colored his pics .... also, I don't know how to draw big boobies too T.T ...
I would like to join the group .. . I haven't touched my pencil / tablet for months and now I feel like I forgot how to draw again those basic shapes ....
Saw the colored one =D your style is much better than I can do since it looks like I did my coloring in MS Paint XD you took the effort in correcting the eyes ( I got lazy and just plainly filled it with brown ) Feel free to use the lineart