Very nice shot Cedric, this rock is a "meaty" subject. By meaty I mean full of interesting detail. In addition your sky was outstanding at the moment of the shot. I gonna ask you for just one small experiment: can you increase the contrast of the sky and the rock a little ? I would see the sky much stronger, the rock will pop forward and the feel of space will be much greater.
Thank you Timor ! I really like this photo becauseit has a lot of details indeed. I will try to do what you advise (I am really really lacking of knowledge in terms of post processing..). I have had Lightroom for maybe 10 days and am yet to try anything more than levels...