I thought some of the more experienced members might have said something by now. I hesitate to offer advice as I'm a total noob. I think the others might likely mention, though, that your painting would benefit from a bit more contrast (shadows and highlights) to bring out the form and details a bit more.
I like the drab colour scheme you chose, as this is adds some realism. If the shirt is meant be leather then you made a good job of that effect too (but if it's meant to be wool, then it looks a bit too shiny at the "collar").
It's still a good figure, and probably way better than I could do at this stage.
That's all I got, sorry.