Anyone who thinks that Lars Jonsson paints his birds too round and fluffy should look at the shapes our birds have adopted to trap air in their feathers during the heavy frosts.
Little Grebes always look fluffy and are really small little birds. I tried to get a picture of one in mid-dive today, but it's much more difficult than I thought it would be. There isn't much change between this resting attitude that they adopt as the move around.
This was as good as I got and it isn't sharp on the head. I think you need a super fast motor drive to get the full series.