@1Sasha, I don't know what cutting technique you're using but a lot of your cuts not only have snow at the top of the head but a strange white line on the side of the neck.

If you use remove.bg on the source image, you shouldn't get anything like it.

Here's a couple of videos on how to use it, one when combined with Photoshop and another using photopea.com, which is a free online app so close to Photoshop that it has the same shortcuts, layout and icons.

If you don't have Photoshop, photopea.com is the tool I would recommend to use to tweak the draft cut produced by remove.bg. It's more powerful and versatile than GIMP and other similar tools.