I have this prbolem when the portraits tha i have created

I am created some player portraits and in a lot of them appears a white line over the head

Somebod can help me??
Thanks

Easy fix. Use your eraser tool. Try making a black layer under the photo so you will have some contrast to see if you missed any background sections. Delete any leftovers. Then delete or turn off the black layer so you have a transparent background.