I briefly tried to entice my teenage son to stamp collecting with a a cheap sampling of stamps depicting snowboarding, at which he is relatively adept (flips and 360s and such). He said they were, "cool," but that was as far as I got. The half-dozen I'd gathered vanished into his room never to be seen again.
For starters, you might have a look at the American Topical Association lists for skiing and snowboarding. For snowboarding they list 117 at present, but for skiing they have hundreds in various divisions/categories such as cross country, downhill, aerial/mogul, etc, etc. I suspect there is significant overlap among their skiing lists. https://americantopical.org/Checkli...opics#SPORTS
and scroll down to "sports - skiing"
Since we like pictures, here is something that came to me some months ago from France and which did not vanish into my son's room. One of the new-fangled barcode things that I do not have to deal with cause my France collection cuts off in 2000... or thereabouts.