@Nassim Fasihi, please have a look at the guidelines in this thread on how to make a good cut-out, especially the fact that there should be no more than 2-3 pixels beneath the chin in every cut.

I suggest using remove.bg to get an initial draft cut, since the edges of your cuts have no hair detail whatsoever.

Here's a few tutorial videos to help you out.

How best to use remove.bg:
 

How to shift collars upwards:
 

Rotating sources:
 

Also, if you're uploading multiple images, please do so using the upload pack button as displayed in the below video:

I've re-cut this one to demonstrate how better the cut looks when the above techniques are followed.