I've been doing a bit of acrylic/ acrylic washes, combined with inktense water color pencils. When you use an acrylic medium, like glazing medium, or air brush medium, (instead of water) the inktense pencils become stable like an acrylic wash as well.
It looks like you did a few air-brush splotches too.
Those blobs of white were done AFTER I uploaded the image into my computer and were done during the digital clean up stage. After I got rid of all the sloppy junk around the figure, I just put the digiatal brush tool over those areas and....tap..tap...tap...and there they are. This was done about seven years ago....seemed like a nice last minute thing to do at the time. Not so much now