the green colouring is not filled in properly the proportions aren’t right
it seems… rushed?
i hope you draw for yourself not for other people…
you have to take your time
It’s not supposed to be some kind of a cool artwork, just a quick drawing
but even then, other people also make sketches but, they are way better than any of my artwork.
I love the way you drew the Miru, it makes it look like Lewa is smiling and having a good time 
I don’t, his head is huge! He looks like a funko pop, his arm isn’t bent enough and one of his feet looks like a metru foot, his axe is too small and his legs are different sized
he just looks off, he looks better if you squint your eyes and look at the real one, I’d sugest doing a few normal positioned test Lewas