Oceanic current: the dynamic looks good but the temperatures should be colder.
You mid latitude current are partially running under the ice sheets. I would consider then cold instead of mild.
So currents flowing toward the equator are also colder.
I think generally, this will make most of the currents colder.
Theia-Equirectangular-WIP-climatetut-currents.jpg

About pressure:

Your maps lack high pressure systems over the poles.
Since you planet is covered with thick layers of ice in the polar regions, it has a constant high pressure system there. It does weaken in summer but would still, be strong.
It acts like a convection movement, sucking the air from the high atmosphere downward on the pole and then push it toward the equator while being deflected toward the east because of the Coriolis force.

For the rest sadly, there is a lot of guesswork.
You low pressure systems over the ocean in mid-high latitude would shift closer to the equator. Probably around beyond the edges of the ice sheets.
The water being warmer than the ice surface, it can create a big difference in pressure and strong winds like on the southern seas on Earth.
I also think it would shrink in size horizontally, covering a smaller area latitude-wise.

The subtropical high would likely also be pushed toward the equator and also shrink in size.