Second Painting : Modern Day Pin Up

So, here is my the start of my latest painting in class. The first one isn't quite finished but I will post a picture here when it is. I seem to do a juggling act when it comes to my work. Here I am posting the picture that I am working from as well as the first few hours of work on it. Be gentle in your thoughts or comments. The proportions are still way off...large forehead....chest too sunken in and the skin is way too days. This is still the under layer so that I can see what I am working with. It takes time for my work to build up into what I see in my head. Right now the pin up looks a bit old. My intention is to have the skin very pale in colour as well as the right side of the background and hopefully she will sort of blend nicely into it. The lighter part of the< background will eventually be a yellow...I suspect layers. I am thinking of adding a tattoo on this ones arm to update her somewhat. I like the old look with the new. Otherwise this one will look too much like an old pin up.