You don't have contrast, here's your screenshot in greyscale :
So i tried to mix things a bit:
Few things I modified (in a very fast/rough way)
- more contrast
- more colour on the player squares
- faked an available movement area with more colour
- made all the HUD in greyish to make the battle screen more important
- your two bigger info on your HUD were the 'equipment' and 'character' titles, and they are not so important
- I got the feeling there were lots of small info on the center tab, i made its content bigger
- brought the icons from the down left corner to the center, to keep all clickable icons in one place
- put some space behind your HUD windows and unstick them from the borders
Overall it doesn't look nice, but it's easier to read what happens on screen.