I think it would be helpful if you could articulate what you were trying to achieve.
I mean, what I see is:
- some pretty heavy and (to my eye) clumsy and unnecessary vignetting
- an artificially bright halo around the tree
- the sun is blown out
- there's no real detail in the shadows
and I thought the whole point of HDR was to avoid things like blown highlights and lack of shadow detail.
So to my mind it doesn't look like a "successful" HDR. But I don't know what you were after, so my comments might be totally inappropriate.