Okay here is a quick draw over I did of your model.
First the overall design isn't bad. But there are a few problems that need addresses.
1: That extrude you have there. Try to do it without touching both of the edges of the angles.
I would say drop two edge loops in there, one at the top and one at the bottom. Then extrude it.
Actually edge loops might be a little extreme in this case, but you get the idea I think.
2: This line is to thin, and the extrudes to deep. When making the bottom one extrude it in, but keep it at the same elevation, give it some space between the edges and then extrude it up.
3: From what I can tell you should have some polys to play with on this model still, so use them.
Create frames for these indents, it will look better in the end.