I'm new to InkScape and I've been having some issues cutting out a vector that I got from an online raster-to-vector website.
I successfully cut out most of the white space and began testing colors on a layer beneath the black outlines of the vector. However, some of the white is staying:

When I try to erase the white part of her shoulder (or any of the white for that matter) this is what happens:

I have no idea what I'm doing wrong, and it's stopping my progress in its tracks