This is definitely one of those pieces that is "never quite done". I know ALL about those. I'm not sure if it was frustrating for you, but what I can tell you I'm sure of is that the lighting and angle of this piece is incredibly well done. Also, you have an interesting choice of colors... but color isn't something I pay attention too that often. Cough... cough...

Being completely honest -- the falloff of the lighting in the corner seems a little choppy to me -- but at the same time it goes along with the painting's theme. So even that isn't a big deal.

The bottom line is -- Your work has always been original and interesting. So just keep it up kiddo.