Brain Test Level 531 Which one is cheating?

Daze Puzzle provides a complete walkthrough for "Brain Test Level 531: Which one is cheating?".

By Emre Parlak /
Question
Which one is cheating?
Hints
Hint 1:
Notice that one of them wears his shirt weirdly.
Step 1
Answer
The guy on the bottom left corner is cheating. You should roll up his other sleeve to find out.