I definitely see the welsh and I think he could well have Shetland in him, he just has something about him...
Welshies can be 15hh+ depending on which section they are! I know a gorgeous Welsh D that is at least 15hh. So it is possible he could be a bigger section Welsh crossed with a shetland.
To me he sounds like he is VERY welsh in personality. I love that cheeky streak.
I really like him, he is lovely. I love his shoulder!
...can I have him?? LOL (not really, I'm way too tall for a 12.3hh pony - not for "looking big" but for saddle size. I can't ride in anything smaller than 17 inch)