Episode: The Core
Wayward finds drawing sitting Transformers difficult, as she's never sure quite how to bend the leg at the shorts. Starscream seems to have been co-opted for the role of Seated Model. Here he is from the back.

Episode: The Core
Starscream seated, three-quarter front view. Also note that his left foot is hovering.

Episode: The Core
Lining up a shot with some funky rifle.

Episode: The Core
Yep, he's sitting again.

Episode: The Core
And this time he's sitting on the ground after Devastator threw him.

Episode: Traitor
Just a neat angle of Starscream about to shoot someone.