The head definitely makes me think Arab cross.
I don't see the paso fino, but the only experience I'm drawing on is the one paso fino boarded at my barn vs. the TWH also there. The TWH is much, much taller than the paso. I just can't imagine an Arab/Paso cross being that tall
Arab/Draft could also be a possibility. He's got a pretty powerful looking neck, but that wouldn't explain being gaited.