you can't redraw the hair to put on the other layer?
it does sound like more work but it might fit better
I could, and it would likely be the easiest solution, but I'd much rather learn a new technique in removal of annoying pieces of artwork.
try de-drawing the scarf entirely on a new layer but just cut-off once you hit the mane, basically just stop drawing once you hit the border of the mane layer.
this will make it seem like the scarf continues under her mane.
if there's any color overlapping onto the mane, just use the eraser tool to do some touch ups.
i take it you're using a tablet and photoshop, right?
(I'll assume de-drawing meant re-drawing)
I'm using a tablet, and although I am mainly using Paint Tool SAI I can easily transfer over to Photoshop.
With the re-drawing idea, I could just take the current version and erase all connected parts to the mane and then re-draw those lines/colorblocks (as i'll call them) and do what you suggested. Re-drawing the entire thing, although possible and simple to do, would be a bit more time consuming.
In the long run I could re-draw pieces to fix it, but I'm looking for a useful technique if one exists. If I get nothing, it would only take me <1 hour to redo the mane or scarf in a separate layer. Or not, my method is of drawing is time consuming too.
There's something off about the head/face that I just can't put my finger on
perhaps it's the eye position.
i haven't been able to figure out a problem but perhaps /r/mlpdrawingschool will point one out.