Some notes for Enydimon's Character

Very flattered that I am able to inspire with my work.
Great sketch !  I like his MMA attire and overall feel. 

A few things to think about.  Becareful when drawing arms.  Our biceps slightly
face in when in neutral stance.  Look at the arm as a whole.  Nothing that happens on the figure is accidental.  Look at the hands
and they will tell you what the forearm should be doing and the forearm will tell you how the bicep should look.
Figure out the hips.  Is he standing straight?  We tend to favor one side when moving or standing naturally.   The arm that's
raised will cause some stretch action along that side , the shapes should reflect that.  Even in the chest, the arm that's down
will cause that pec to be more bulged due to the mass.

Try and answer more questions about your character.  Example:  Is he ready to fight?  Is he relaxed?  Is he getting ready to fight?
Is he confused about the opponent he's about to throwdown with?  Who sponsors him?  MMA fighters usually have more ads on their clothes.
Is he just starting out?  etc.  The more questions you can answer the easier it will
be to pose your character and figure out what types of accessories/details to add on. 

Hope this helps.  Keep rockin!