Just to go back to the dragon piece on everyone saying realistic, I feel the same way, but realistic is not the word. It doesn't have to be realistic, but what is coming across is that the dragon is too obviously not part of the original image. It sticks out and is obvious you have added it in there. So blending is what the piece needs overall.
With the reflection as well, Signomi's idea for the shadow is a good one, but either way, it needs to be way smaller. The dragon is quite a bit above the water, so physics says it wouldn't be that big cause of perception or whatever, but yeah.
Also, I feel the background mountains are like almost vector looking. Not sure if intentional, or product of heaps of adjustments and blurring and stuff, but I don't think it feels as good with the 'photo' like qualities of the rest of the piece.
And I think the colours could be more cold, they are sort of too pink everywhere, either bring out the warmth heaps and get more reds and blacks in there, or go cold. You are sort of stuck in the awkward middle of cold with some beefy pinks.
As for the new piece, the ridiculously large resolution one, it looks really good in the small view. But when you go full size, that's when you see the little things. So part of me wonders if you were working at it, alternating between full size and a more general size, or just whatever fit your screen. Things like white pixels around the flowers where they have been rendered a little sloppily, the giraffe mane looking a little clunky (although I know hair is a pain in the butt, but if you are going to make the resolution so large, it becomes really obvious and if you aren't going to add extra effort to really make it perfect, then don't go with the massive resolution.)
But the main one that is both distracting, a silly mistake which just seems to be missed because you didn't work with it in full size, is this white splatter / pixel line over the Toucan. You can only see it if you go full size, but it is actually quite distracting, and just looks really sloppy.
I'm also not a fan of the text. The clipping mask / overlay is a little cheap looking, doesn't feel to nice and crisp and is a little difficult to read, just because it really blends in with the hectic colours and patterns behind it. I'd go just a solid colour, but yeah, needs some tweaking.
Lastly, the background being just solid grey I think is a little bland. It just feels too empty in comparison to the focus in the middle. Yes you want to draw attention to the actual content, but a quiet pattern or texture overlay would look nice, just to make it a little more homey and less sort of antiseptic almost. It is like too smooth, too pristine.
But yeah, quite good, definitely one of your best pieces, but just be wary of working in the big resolutions. Everything is like 10x more obvious. :P