You! You my exceptionally perverted child, are amazing. On the entire DeviantART website, I could never find a better picture than this that, in my standards, captures a humanized Celestia for was she truly is. I can see the clear cut of her beauty that is the sun itself, the bringer of life to a planet of many, not just Equestria but also several other realms. Viewing this picture, I can witness the contrast between a alicorn Celestia and a human Celestia, both drawn and animated superbly. Yes, my friend, 5-stars all around. You have made a sci-fi writer like myself proud to assimilate a character like Celestia into my fanfictions.
"Come on you target, for far away laughter. Come on you stranger, you legend, you martyr and SHINE!"
Not being an artist I can't critique you technically, but I can tell you my impressions, and I talk about what I like. I love this! Frankly, I'd like to favorite your entire gallery - but it's easier to pick one piece and use it as a link. This is the work I picked.
You nail Celestia's expressions. As a human she is eternally young, but motherly - the smile is perfect. As a pony she is serene, but a little sad - it's lonely at the top, and this is a ruler who can make hard choices. You have drawn characters that I think I would enjoy meeting.
I also love that you gave her a gown to match her mane instead of just a white one.