@Dmitri Khokhlov  you may want to check your cut on a black background and try again.

This time I have re-do the cut for you.

Something that can save your time would be sth called remove.bg and you should try it when you are producing cuts later on. 

@Dmitri Khokhlov, adding to what @Ttggfr said, have a look at this tutorial for remove.bg and photopea.com so that you can provide excellent cuts quickly and freely:

I've zoomed in on your cut so that the snow, artefacts and unrealistic head contour shapes can be seen more easily. These can be all avoided the above method is used 👍