I think your imagery is good- I like the trees being square shouldered.
The first line is just a bit of a non line-JDP is right though it can esaily be tweaked I reckon to capture the attention more.
How about combining the lines?
The trees were thin and square-shouldered, tall enough to obscure the moon and dark clouds from view, as two figures threaded through the forest; stick like in stature and half lit by stars. (ish)
The place is named later-when needed, so personally I wouldn't share it in the opening sentence.
Very atmospheric in tone which I like.