Sorry to keep tagging you @JugadorFM, but it's important you get to know these little things since you're still starting out.

Please remember that we want all cuts to include a little bit of collar. At the same time, the ideal cut only contains 2-3 pixels beneath the chin. Since in some sources like this one, the person in the image may have a longer neck than usual, this would be quite difficult to achieve naturally.

I'll fix this one myself, but please keep it in mind for any future cuts you may do 👍

Here's a video of the process on how to nudge the collar upwards:

Also, a few of your cuts have some snow. Here's how to spot it and easily remove it: