1) On the hill a big tree stood.
2) On the hill, a big tree stood.
3) On the hill, stood a big tree.
In my opinion, (1) and (2) are acceptable but awkward. They could indeed be improved if another adverbial were included at the end for the sake of textual balance:
1/2a) On the hill(,) a big tree stood among a thicket of bushes.
Sentence (3) is outright wrong to me because the fronted adverbial attracts the verb, and the comma disrupts that effect.