Yeah I figured I was stretching believability with having those two mountain ranges, I mostly just drew them in for the rule of cool, with the weak excuse of it being more geologically active = wacky tectonics. If the geology was more realistic I would probably get rid of one of those mountain ranges, but I'm a bit more concerned with getting the planet's climate right than its geology

"From the same area you have a cold and hot current diverging. It would make sense if they converged there.... A warm current starting from a polar region seems a bit odd (this also happens on the easternmost side)" - That's because they're only warm currents relative to where they came from, I'm sure the currents themselves are cold but since it's traveling to were the ocean's even colder it's a warm current Edit. forget my answer to the first question this answer applies to both

Everything's just lowered below sealevel, and perhaps had been so since before the last glacial maximum ended, meaning a lot of the coastline above the Alps is pretty cliffed, with the border along northern Russia being littered with fjords created during the Ice Age