Thee head is rly plain... Need more detalies, better shading... And what is this black on the left? It needs more time... also this circle on the back should be a way smaller
i know its cartoon... but cartoons needs shading and detalies too... doesnt it true? Also this circle missing 2 elements of material ;d and the shading in this style of head should be shark, not smugget like on material
Sketch
Shading and Detail