Change your brush size often as you work on a bad
area. This will help things blend together more evenly.
If you do too much damage the first time and want to
start over, just throw out the top layer and make a new one.
To save time I traced around the image with the lasso
tool and removed it from the bad background. It was much faster to create a new
background than to repair the old.
You may want to make selections around some areas
before you change them with the rubber stamp tool. For instance, when you are
working on an area of the face that is close to the hairline. You don't want
any of the face color to get in the hair. Select the area with the lasso or
another tool before you use the rubber stamp. Only the area you have selected
will be changed. Hit CTRL H if you want to hide your selection.
Sometimes you will forget that you have done this and wonder why your tools
aren't working in another area. I do this all the time, so now it is habit, if
something isn't working hit CTRL D and make sure no selections are