The story of David and Goliath is well known all around the world and I feel no need to explain, although if you are unfamiliar with it. Please feel free to send me an email and we can discuss it further.
Depicted is David holding the head of Goliath by the hair. David is not concentrated on the head but rather looking up, while holding a sword his is right hand.
The main pattern I see when I look at this painting is the use of red. David has red hair, accented by his rose red check, red feather, and red strap, which is over his right shoulder attached to his satchel.
When it comes to movement there is honestly is very little and by little I mean its only located in the tips of the feathers. The painter seemed to make the tips a bit lighter in contrast/hue compared to the more central area of the feathers red, and the blotchy areas all the way at the top of the feather. How they loose visibility and begin to blend with the background, just like a feather would in real life with the slightest of movement.