Maybe something could be done with the color of the leaves and grass (not so much change it to a solid blue or anything, but add some different colors throughout the forest. A good amount of trees could still have green leaves, especially during the speeder bike chase scenes [as it would be near impossible to alter the leaf coloring during the chasing].)

In regards to the DS2, how would it look to have more than one large trench? Instead of just the central equatorial trench, what if you had 6 all interconnecting to the (now centrally located) super laser. Hell, what if you had energy race down these 6 trenches to the laser dish when it fired (to further emphasize that the DS2 is one gigantic cannon)?