Marcos,
Congratulations in actually going out into the forrest to look for wildlife! A lot of different shots, some framing a bird closely and others more of an environmental landscape nature. I'll address just the more tightly framed pictures of the giant cormorant.
Currently, my mind is orientated to pictures in an exhibition, as opposed mementos. So allow me a more critical frame of reference, remembering that
my view is only one of many that you should consider .
The birds are captivating and you've a lot of good data in the files. I have taken it upon myself to see what further riches I can bring out in a few of them. All the changes are made with just iPhoto as that's what I have on the computer at this desk right now. For RAW files, I'd do adjustments in Photoshop with layers and layer masks to make sure that each element is processed optimally for its own needed importance and rank and to fit in harmoniously in the composition as a whole. I have addressed composition, exposure, contrast, saturation and to a tiny extent sharpening which is hardly feasable on already compressed jpg images. All these parameters need to be addressed using RAW 16 BIT large gamut, (ie ProfotoRGB or Adobe RGB 1988), as 8 BIT sRGB has lost 99% of the data!
So consider these just iPhoto sketches.
So here goes:
Marcos Meneghetti
Original
This picture I like best as it has the most energy and interest. At the left, the water and rock edge are too esthetically captivating for the edge of an image. The bird
must be the star. Ideally I'd add more water to the right, but it would take more time. Then the feature on the left would be balanced and the bird would still be the main feature. So a simple crop instead. This I do knowing perfectly wll it takes away a lot! It could be that with the RAW file and careful attention to blurring and sharp focus, we could keep the beautiful elements on the left after all. Right now, it needs balance.
Marcos Meneghetti picture
edits AK
Marcos Meneghetti
Original
Here again there's too much introduction on the left before the bird! So it's cropped too! It goes from bland to more interesting but other features are need such as another bird, wave action, an interesting plant feature or a low shot getting in some sky. Think of lying flat on the ground and and changing ones position. Like this, elements leave the field or are brought in. The bird without colored plumage, wing flapping, feet creating a wake as it lands or the like, one can end up with a dull boring picture. It's hard, but that's the art of photography, to make something ordinary to be seen as extraordinary. Anyone can win a prize for the assassination pictures of a dictator or rock star or a lion eating a horse, but a picture of a brown bird on a fairly still body of water is much harder!
Marcos Meneghetti picture
edits AK
Marcos Meneghetti
Original
Marcos Meneghetti picture
edits AK
These ideas are just a suggestion in bringing out the strength of your pictures. Don Cohen, a really experienced Bird Photographer, hopefully has added his more informed point of view. Hopefully others will follow with some hints for better bird pics!
Asher