Turkish Money

The portrait on the front of each bill is Ataturk. 

I didn't have any issues with the money in Russia, but with the green 20t bill and the same tone of blue as our $5 on the 100t I've started confusing the bills when I pay. No one would ever let me under pay but sometimes people hand me back a wad of bills when I give them a blue bill and I end up with an awkward moment with a stupid look on my face.