Is it ok that I practiced my own makeup skills on the kids in my neighborhood?
Why did you want to practice makeup on the kids?
I can experiment my new skills on them.
It is good to hone your skills, but not at the expense of other people. Doing this to another's child is doubly bad and could lead to conflict with that child's parent.
I loved seeing the freaked out and panicking look in the kids eyes.
Ask the parents and children for permission first if you wish to do this to them. If they refuse, you should stop and find someone else who is willing to play along with you.