The work here is really interesting, you try to do a lot of detail with only 2 colours (galterbelt, fold on dress etc...). It's a good job.
Here's few tips, I think the collars bones are to massive here and the thicc outline is a bit to much on her breast.
Her pupils can be a bit biggers, because it's a bit hard to read the eyes correctly with only two colors.
Other thing, it seem you wanted to make volume on this pieces, with the legs shading, I think you could add white shading on the breast in order to make wolume instead of just a shiny stripes. About the fold below her chest, it could be nice to don't broke the lines.
Her legs are also to geometrics, try to add some curves and it will be really nice ;) .
If you want I made a quick edit to illustrate what i was talking about (coz my english is a bit aproximative sometimes).
oh thank you so much! more thanks for the feedback, and even more for a quick edit OuO I would really like to see it :D hmmm how to do this 3: I guess you can either e-mail me or direct message me on Twitter? :D