Its a good taunt (I LOVE THIS DAMN IDEA)
The animation is crisp and has some good touches but the only thing to improve this awesome taunt is for the scout to move his body or like lean a bit or maybe even kneel down more when he's spraying the wall
(it just looks a little un-natural in my opinion)
And of course, this is just my opinion. if you do this of course- you don't have to.