Thread:Doctor Ibrahim/@comment-27550231-20160810043758/@comment-28358106-20160814201534

Just BE SURE you're on the new layer and not your background image. When you're working with a large image,  it's always best to make a new layer for every part. You'll save yourself an enormous amount of headaches if you do it that way because if you make a mistake it's only on one layer.

To erase what you don't need, just select the Eraser tool four spots down from the Lasso.