Advice on improving

[redleg7]

Hello All,
Looking to improve or acquire some new techniques.

Although I'm generally satisfied with how things turned out I'd like to work on improving the following:

1. I'd like for the "ground" to look a little more realistic. I usually apply the noise filter and do some shade rendering but it looks to uniform.

2. I want to make my buildings a little more weathered, they look to clean.

3. I also want to add some agricultural elements like cornfields and rice paddies.

4. I think a swamp might be in order as well.

5. I've come a long way in making my trees/forest. Any improvements would be welcome. I use a wet brush and then apply some noise, layer effects like drop down shadows, and some light rendering.

This particular map is based off the Operation Ivory Coast the raid on the Son Tay POW camp in N. Vietnam. The map was created using Photoshop CS4.