I'm not trying to be an annoying "know-it-all" but seeing as how he may not be a purebred QH/Thoroughbed (which he'd have to be to qualify as a Paint) he would technically be a Pinto, not a Paint. Sorry, I know - not importaint! LOL
Anywho...Who knows what's in him! I love his Overo markings though! He could have some belgian in him or maybe some clydesdale. There's no telling. My friend has a mare who is "supposed" to be a quarter horse X belgian & you'd NEVER know. She's about 14.2, solid bay & looks like a quarter horse with no hint of any draft. She doesn't even have feathering.
Your guy's got a clydesdale face it seems to me, which could account for the face, leg & under belly markings. Just a guess!
*hugs her mutt* He has some show anxiety sometimes so I trailered him out with some of my kids school horses yesterday to just walk him around the grounds without the stress of throwing him in the ring and had the pleasure of over hearing this:
'Oh look at that Vanner horse!'
I was like o.O Really? ...this thing? Lol non-horsey people at horse shows make me LOL.