Photoshop is one very powerful tool.
One rather naive tool as well.
It probably is even better than plastic surgery when it comes to looking pretty.
But something people need to be aware of is, the virtual world and the real world consists of the same people.
If you know someone in real life, chances are that they would be able to see your pretty-but-oh-so-different face on the internet.
And even if you do, don't make it so blatently obvious, lol.