The lack of detail is IMO caused by too much zoom ... give the shots a little more room, more perspective, give us more to look at

I think you're missing some nice clouds and sky colors to start with ...
And you might want to consider looking for some light replacements. Check out
this one.
And while you're at it download his
dust and water effects too

But that bird is a classic! It looks very nice for Abacus quality
