This guy has some domestic duck hybrid tendencies (not a pure Mallard). I agree with Randy on a bit of a crop at top. I like the wake in front of the chest, and good high-key look to the image.
Yes, and also the bit of white under the chin. The breast is brown in pure Mallards, with a thin white "collar" delimiting the green neck. The shoulders and flanks are also normally much paler and grey...there is perhaps also some Black Duck mixed there too.