Ahh ok, sorry about the long post! I really love your style! It's really quite unique, and it's got charm!
I can help you out with a few things. First for jawlines, you have to make sure you're line is steady, and not kinda squiggly, but also not too pointy.
I cant explain it well, so here's a little chart:
For clothes, make it flow! Creases are important, but make sure they always follow the flow of the fabric. Also, when a skirt is tucked in, it usually creates a little muffin top; it's hardly ever straight down. Made a little graph for this one too:
Honestly, I think you're faces are fine. They're stylized, and I like it! The shading on the hair is nice, but I think it would look nicer with a bit more of a highlight. Try concentrating lighter stands in the direction of the light souce. (If that makes sense >.>)
As for pricing goes, I'd say 150-200 tbt for a waist-up like this one. RLC might not be the best idea right now, but you can always keep it as an option.
Also, kudos on the roses! I can't draw flowers for the life of me...