I like her face, it's pretty. Big lips look really nice on most women. And the curls accentuate her ample features. I feel I'm come off as being annoying for critiquing a concept doodle, but eh. The lower portion of her looks more like a child's. A petite woman has more definition in their structure then that.

Pay note that their shoulders would be wider and narrower (even though I noticed her shoulders are more drawn back and are giving the allusion that her head is bigger then her body), with more show of muscle (or if any) in the given places. Her ribcage also could use more widening and a more curve. All I see is a straight line instead of a curve.

Here is a little example:
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Critiques are welcome on all of my pictures, even the simple concept drawings so don't feel like you are being annoying. The comment actually helped me a lot because it made me realize my main problem with my concepts of my characters. The story's timeline will look at the years when they are between the years 11-13 and 18-20 (I think). However, when I have been drawing, I don't think I was really determining what age I was drawing them at, so I think both young and older charactereisitcs were coming through the drawing, which is really stupid. I need to find reference pictures for the appropriate age before my next drawing.

Thanks for those reference pictures. They will help me with drawing a petite frame.