Nice work so far Kero. Your plates look fine though each group of landmasses seems to sit in the centre of each plate a little cleanly. You could have plates cross continents like how eastern Russia is on the North American plate. Also Japan has a tectonic border pretty awkwardly across it. Iceland also has a tectonic border right up the middle. As an exercise determine what directions your tectonic plates are moving in as this has a massive effect on where mountains form. Plates that are moving into each other tend to form mountains while those moving apart get rifts and other geological activity. Earth quakes obviously happen most at tectonic borders too and may not form mountains per se.
Ultimately it matters most where you want your mountains and volcanoes as no one sees the exact boundaries of the tectonic plates on the final map anyways. If you are happy with it it looks fine to me
Be aware that other northern bits of your landmasses could have some glaciation or at least snow cover too as parts of them are more north then that southern bits of your northern continent.
Look into rain shadows, which is where mountains and highland can make one side of a mountain range lush while depriving the other of moisture. The best known might be how south of the Himalayan mountains the climate is extremely moist and rainy while north of it has deserts.
Also, ocean currents can have a major impact on climate. For example, England and western France benefit from a warm ocean current coming from the south which keeps it warmer than directly west across the Atlantic. South America is a great example as the east side gets warm currents coming from the equator while the west side gets cool currents from down south. Sub Saharan African has the same pattern.
I would say to worrying about the size of the planet it could be a much denser planet than earth and thus have a comparable gravitational pull even though it is smaller. Every planetary body has its own rotation speed too so days may be shorter or longer on this planet as well
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