yes do what dave suggests and add a bevel to the upper diagonal edge and along the red arrow this will add sharpness. Then you will need to turn any resulting n-gons into quads or tri's.

I made a quick mock up of your topology and below are some screen shots of the basic idea we are talking about...

Here I have tightened up the leading edge and the inside corner edges but you can change the bevel strategy to suit your needs.

Cheers.