This is just really amazing. Ho-Oh looks very lively and the shading and lighting makes him really pop out from the background. You can actually see his marvelous plumage, which a good majority of fan art doesn't do, and the only other time I can remember Ho-Oh being this vibrant was in SoulSilver, and this piece here looks marvelous. I just simply love this. You can really see Ho-Oh truly living up to his name as the Rainbow Pokemon with all the colors being displayed very proudly. This is a wonderful piece of work, here. (Also shocked that I can give a critique as a non-subby person (for now), but I digress.) Very very wonderful.
The colours really catch my attention and how Ho-oh has detail that makes it look realistic is just plain awesome. Also the background does sute Ho-oh's colour scheme. The shading and lighting are really well done. Ho-oh's feathers also look lively. As well as me being a pokemon fan I give this deviation 5 stars all the way and this is my first critique so it is not easy writing one (or rating it). Overall I think this deviation really did deserve a daily deviation. In short to this critique: this piece looks like a whole tonne of effort had been put into it.
The colours in this are divine, very saturated and bright! And how you've drawn the sun's rays behind Ho-Oh is astonishing. Congrats on the DD! Very well deserved, I can see the effort that has been poured into this piece.