We need to see a conformation pic - horse standing sideways on with no tack to give you an idea of which class - also need to know height and breed.......
As a Connemara the obvious choice is the M&m classes however (and please don't take this the wrong way) he looks somewhat weak for the M&m classes and one of the more sports pony type.
If you are young enough then I personally would plait him up, trim him and show him as a hunter pony or sports pony