[...]but wonder what is your conclusion...
It's more of an opinion than a conclusion really!
My first reaction on seeing the picture was Honey buzzard, but then when Marsh harrier was suggested, I thought ''could be...'' and decided to let it go (I was involved into too many controversial ID threads recently).
Anyway, here we go:
- If the primary pattern is real then no way it's a Marsh harrier.
- the tail is long but its shape looks somewhat problematical for MH; if it were just a little broader-based then it would be quite perfect for HB
After my editing:
- tail shape not too bad for HB
- the head appears somewhat smallish
- the fingers of the right look blunt tipped
There is another detail I hesitate to mention because I can already hear a few "How on Earth can you see this on such an image? bla bla bla...". On tweaking the levels: there is pale spot that starts to appear where the eye should be; it looks particularly bright stand out quite well...suggesting adult HB to me.
Yet, I do understand where the Marsh harrier suggestion comes from and I would have no particular problem to leave this one unidentified...
For example if it a HB, then how old is the bird?
The dark fingers are suggestive of a juv, but the general structure doesn't shout juv HB to me (wings proportionnaly too narrow), perhaps one of those female HB with dark fingers?