want to add that if I were long arm quilting this, I'd suggest using a mono-poly (I like Superior's or YLI) on the dress--following some of the piecing lines just enough to anchor the figure to the backing without distracting from the pieced dress. Then I'd use a blending yellow Superior BottomLine to do a fairly tight but not very intricate design in the yellow background--maybe even just wavy lines about 1/8-1/4 in apart. I'd first closely outline the figure. I would not quilt on the hair or the figure at all--too distracting. Also, I'd probably use a poly (low loft--for some reason I find it easier to use doubled low loft than a high loft--fewer tucks & puckers) as it's a wall hanging and likely won't be washed. Plus the poly does not hold creases as much as cotton or cotton blend---and I'd be thinking you would be entering this into some shows so you don't want creases. if it was larger and maybe plan was for a bed quilt, then I'd double bat 80/20 with washable wool on top to really make the lady "pop" Please do show us again once it's quilted!
also you don't show where you live, but generally speaking prices for long arm quilting tend to run lower in the midwest than either coast. I do know some people mail quilts to LA but frankly, though I long arm and have family members mail quilts to me, it seems as if there are enough LA that you'd find someone near so you could truly see their work. In the KC area, edge-to-edge or pantos (neither which I'd guess you'd want!)run about 1-2cents/sq. in; custom goes from there upwards depending on the number of thread changes, amount of marking needed, density of quilting, intricacy of the design, etc. the design I described to you would probably be somewhere from 3-4cents/sq. in.