Besides the sun, the rest of the image just seems too dark. The viewer really can't see much else. I think it will look better if you make it black & white and increase the contrast.

I agree with satya, it needs more contrast.

Hello Gael,
The flare on the sun is cool. You have lots of colour in the grass and trees so if you lighten the photo you won't wash out that colour and you will get more detail in the dark areas. Place the sun either exactly in the centre of the photo or one third of the way to either side, you want serious symmetry or serious asymmetry but not something that falls between those two possibilities. You could also add a little gold tint to the sun, if you were feeling really fussy. :)
Peace,
Mikel.

Hi Gael, very very difficult shooting to achieved, in JPEG apparel almost impossible in RAW you need Filter chroma because the sun enter directly in your iris , but for a JPEG regular it is a real nice shoot in professionnaly way not to good, so next time dont shoot straight in the sun flash but give you an angle that will help.
AlRobi