Wings and blade

This is oil painting??!! Yes, but it is a fake one. I just tried artist oil in PainterIX. I have no idea how to paint oil, so I deal it like watercolor. Forgive my ignorance orz. And I am a new learner of anatomy, I know something is wrong, but don't know how to right itXD,

A blade to fight, two wings to fly. That is all I need.