@giovannidoko16, remember to leave a collar for every cut. Also, when a person's head is tilted to one side like in the source, it's best to rotate it so that the final cut is upright. Finally, don't leave so much space above the head, 2-3 pixels is enough. It's important that you provide good cuts not just cuts for the sake of it 👍

Also, please use remove.bg, your cuts have no hair details whatsoever and remove.bg makes your life so much easier when removing the background and makes for a much better eventual cut. It's easier and gives better output, what's not to like! Here's a tutorial on how easy it is to use and there are other guidelines in this thread: