He does look like the Icelandic in that picture. I confess I don't know my pony breeds well at all, in fact I'll probably be posting a picture of my son's pony to have you all take a guess at. I don't know much about Icelandics, other than I have always seen them to be very heavy in the mane/tail/feathers department, which your pony doesn't seem to be so much, and also very heavy skelatal frame which your pony does seem to have. What is his gaiting movement like? More of a walk gait or trot gait, or more pacing, racking? I am guessing that's what the third picture you have posted of him is.