Stefano, for one of your first, it's not to shabby...your cluttered environment though, makes for a messy picture. None of us here have the skillset to train their wildlife in posing techniques, so we tend to rely on being patient and waiting on the critter to find a better scene. It's called "working the scene/subject".
Hi. Very nice shot. I'd try to photoshop out the grass sticking out of its beak and try to get rid of the bright purple spot. They both distract from the bird.
Welcome Stefano,if you can clone out the grass on the beak it might look better.
Nicely done.
Good for a first try....would seem a lot of work but this is how you improved...
Excellent, except for that purple spot