rainbow help

this is one of my first shots with new tokina 12 - 24.
any tips for PPing this shot to give it a bit of punch? (or tips for setting up WA/landscape shots such as this in general)
cheers
R2
EDIT
thanks gordon but I should have posted this one which is basically as it came out - the previous one was one of my poor efforts at PPing
cheers R2
1/320 @ f9 12mm 200ISO
any tips for PPing this shot to give it a bit of punch? (or tips for setting up WA/landscape shots such as this in general)
cheers
R2
EDIT



thanks gordon but I should have posted this one which is basically as it came out - the previous one was one of my poor efforts at PPing
cheers R2

1/320 @ f9 12mm 200ISO