Based on this post from Contently You, which I found in my Likes from last year. I was very tempted to count this as a double item, since the fact that breasts aren't visible from the angle that the girl on the left is shown at counts as information about what breasts do - check out the Eschergirls (@eschergirls) blog for many examples of artists getting it hilariously wrong.
The attempt at coloring was not a success. I'm still trying to look for ways to make the color differences between my screens work for me. Cloning the colors from the original image is an obvious way to do that that works - I chose not to do that here. But what fun these two models were to draw!