@PavelT, no offense, but I'm getting quite tired repeating the same things over and over again.

a) The chin should only be 2-3 pixels above the bottom of the cut. If the shirt is lower than that, nudge it upwards using the tutorial in the guide to cutting thread as a guide
b) There's a bit of the background beneath the ear to our right
c) I'm not sure the source is big enough to provide a 250x cut tbh

Thanks @mons