what you need is :
1) better fog, it gets too dark and makes the castle to bright which overshadows the units down below.
2) have the units do the walk animation. Either take shots in game or use the editor and make them only have the run animation
3) have projectiles in the air. Make a doodad and make it into an arrow, then tilt it a bit using the negatic pitch/roll angle, and then raise them in the air. Itll give the feeling of arrows shooting down at them.
and you may need a better camera angle. i suggest one from the side, instead from the castle.