I think sprites are drawing ... and drawing is artwork for me ... so you have your section
btw: I've got 5 more sections than you and I think they are enough
... I'm running in 1280*1024 and I still have to scroll ... there is no need of an extra section for sprites ... I would suggestion to cut the model/ skin section and make a "Fan stuff" section instead of it
but the team/ owner saw that much guys were posting their models in it ... so they made it an own section (I think so)