Its a great capture James.

Some tips though.
Try leaving some space for the Ducks to walk into and getting down to thier level.IE,lie down on the ground or get as low as possible.
It will make a world of difference to the shot.

Excellent capture but when shooting these and other members of the Tit family try underexposing a tad to avoid`blowing`the white on the cheek.It is easier to bring back detail in Photoshop from the dark head than get back detail in a blown white I find.
Hope this helps.