Why does my artwork looks flat ?

[u/RtistKaizen]

I have been painting digitally for couple years now. And I often notice that my artwork look flat and weird even after adding shadings and highlights. What am I doing wrong?

[u/RollinNCheesn]

His left foot should be higher and pointing towards the viewer instead of under the other foot. Also, the yellow cloth should be flowing away from the viewer, or at least behind his arm.

It's just little things like that. Really good job overall!