I really like the way you curved the uber-charge around him, it adds sort of a flow to the picture. The shading is another thing I must comment on, I like the way you illuminated the background located behind the birds and Medic, it sort of brings out a dramatic effect to the scene, which I am assuming is a battlefield. My favorite thing though, has to be his facial expression, and his pose. He is smirking as if he is invinsible, which, if he is behind a Heavy,he is. He is holding his ubergun up high and isn't afraid to say, "Hey come at me bro.!" All around this is my one of my favorite Medic pictures.
Vision-wise, your art is good. You capture the atmosphere perfectly and give the picture a sense of action even if you're not showing a battle scene or an interaction between two characters (I'm not counting the pigeons as characters now).
In terms of originality, it looks like the scene from 'Meet the Medic', only altered - which has been done before a few times, so I cannot really say 'wow, this is original!'. But I will say 'this is a nice take on something I've seen before'.
Your technique is good - vague and yet well-defined colour transitions, a good use of lighting and spectacular shading... Really, all in all, near-perfect (I'll never say 'perfect' to leave room for improvement, hope you understand...)
Overall, this image is great. Really, you have altered a scene we all know a bit and have even perfected it, capturing the essence of the Medic in one image. No detail ignored, and everyone will surely appreciate this for the beautiful work of art it is.
Geez, always my bad luck. There you are, drawing gorgeous Medics, especially this one, and then it's not yaoi if you ever feel like drawing Medic/(I don't care who as long as it's not Heavy *cough*Sniperwouldbebest*cough*) slash I would be the last one to complain ^^
Seriously, great drawing. Good work with the doves and their wings and legs, their flying poses look perfect.
The only thing I would maybe complain about is the shade of red for his gloves and the medigun, it looks rather (Barbie)pink to me instead of real red, but 1. it's my bad taste that I'm not a fan of pink and 2. this might be a problem of my monitor settings.