Hi Aldo, A pretty shot of this lovely bird, good composition and colour, I'm sorry to say it is a little on the soft side though, I suspect that this is due to the very slow shutter speed that you used for a zoom lens at 400mm. Unless you have a very steady hand I would recommend using a tripod or at least a mono pod. If you don't want or can't use a tripod, then I would recommend raising your ISO, and/or using a much faster shutter speed. Typically for a 400mm it is recommended to use a shutter speed of at least 1/400 of a sec, if you have OS/VR, you may get away with less but it still depends on how stead you can hold the camera.
Hope you don't mind my suggestions, and that I'm not telling you what you already know, but is a shame to lose out on getting sharper images.