Very different edits. It's impossible to define and look at them as one overall style.
top left - minimal editing, just overcast day and telephoto lens during autumn in the mountains
top right - sunny midday, fall or winter inside the dark forest. desaturated as fuck with few exceptions like blue tinted to teal
bottom left - autumn, overcast in the forest. Greens and reds shifted and desaturated
bottom right - sunny midday. Late autumn judging by the state birches are in. Then artificial ir filter thrown over it.