Please Critique Rosa in a pink dress

This is Rosa, 14" x 11", on canvas. I would love a critique.

I am very nearly fed up with myself, and so I haven't painted in a few weeks. I've been working on drawings and values for that time. After reading a lot of different things, I decided to do something different. I did the whole underpainting in burnt umber. For the final painting I glazed the shadows more or less (I had trouble controlling the value and it got way too dark so I added some white). The lights were painted opaquely with a good deal more paint.

This was a limited palette of burnt umber, raw umber, venetian red, yellow ochre, black and white. I thought maybe my problem was that I had way too complex a palette and really couldn't control the thing, so I want to simplify and see if that works.

A larger image is at http://www.gloriadesign.com/rosapinkdress.html

Long story short, please help.

Thanks
Lisa