thats not the best photo anyway? i know its only a phone pic and you took it and all but its not what i would term a keeper to go on a wall, sorry sounds harsh but I am just being honest..
think about getting it printed as a photo poster in the size of the canvas that you want and see how it looks, its a cheaper way of seeing if it will work at that size, if it works and you're happy with it then go for a canvas print.. remember that with a canvas you have to cater for an overlap to go around the canvas
this is the best image I managed to shoot of Button at F1 quali, Silverstone, this year..
Jenson Button by
Guy Frankland, on Flickr