i have recently changed my username from mytymj to penguinmytymj, how can i get my new skin on my face?

You still have your old name so it wont get your skin from your new name in game I think. I think Crafty will be able to fix this.

As cactus said your profile name on here gets linked with your minecraft account as you are now known as penguinmytymj it won't update until it's changed.

can i change my name then?

nevermind, i'll just have 2 accounts, thanks very much though :D

Yes go to mojang.net or .com idk for sure

Making a new account is fairly easy (It's what I did when I changed mine)