TRSE: How To Draw Tutorials:
Drawing The Back of a 'Chibi' Character at Angle View
Step 3

    The back view is very tricky because I'm used to drawing such views without any aids so I'm not sure if there are easier ways to draw the head in that view. So just do your best to draw a shallow "W" which is to outline the forehead, a cheek and a chin with the eyes located at the depression between the forehead and cheek (add an eyelash if you want).
    The add an ear which can be on the vertical line, but it has to be close to the outline of the face.