I, myself, am an avid Doctor Who fan and absolutely love to see all the different fan arts and fictions generated from such a wondrous pop culture sensation. On top of which, I am an absolute fanatical zealot of My Little Pony fanon and originality and try to keep track on all the fan art generated by this other, more recent pop culture sensation.
To be able to view an art piece that doesn't just express the love of not just one of these lifestyles, but two... it fills me with joy to witness the imagination of the artists on such a prestigious art community.
I am easily able to distinguish what you are trying to share with the community and like how you are able to put your own spin on the Doctors by not just adding in the symbolic items of the Doctor's, like the Fourth Doctor's scarf, but you also add in several of the minor things that we loved to see in use like the Tenth's Void Glasses and the Eleventh's Fez.
The artwork itself is very clean and articulate. You not only gave it an expert animated look, but the shadowing and movements still further adds to the good art presented here.
The only problem, I have, with it is the Cutie Mark. I understand that giving him the same one for being the same person does make sense and is still good, but regeneration would change his person completely and maybe having different Marks would fit just nicely into his persona.
Overall, I only have two thing to say of this art piece: Essayons, Allons-y!!!!
I think it's largely because the show has a background pony they use that is an Earth Pony called Doctor Whooves but I also think it's because Doctor Who was never suppose to look remarkable in anyway.