Grimmo- real nice work so far!!! For a first diorama it really looks like you're heading in a great direction. Keep us posted!
I like the layout, but as model said, make sure it's not just a lot of influence from camo's nice layout, don't be afraid to experiment by moving the figures positions around and the angle/direction of the Humvee, action of the scene etc.
One thing I’ll say, camo’s base is really tall, and yours is a little shorter/wider. Taking this into consideration and with model’s suggestion to try and distinguish this one as your piece, you might want to either:
A. Play to this difference and do something to elongate the scene (not necessarily physically elongate it, but visually- ie lots interest in parallel lines, left to right action, long column of troops all doing things on a similar plane) or...
B. Juxtapose your already short and wide scene with more of a vertical action- ie have all the troops looking upwards or clearing the house in close groups/on multiple levels- in an attempt to maybe have the base appear taller, as if more is going on on the vertical plane, however then you run into the problem of dead space in the areas away from the figure action. This can be solved with cleaver groundwork and debris, abandoned equipment etc.
While camo’s got a lot of busy action on the street level, the tall building and the insurgent in the balcony balance it out. So make sure things don’t get too symmetrical. Make sure your action, while being the center point, is not in the center of the diorama, it looks like the balance of the Humvee will offset the figures, but don’t be afraid to get them right up to the edge, especially if they are a figure that is not central to the story you are portraying. Think of it like a background figure in a photograph, maybe a little out of focus, maybe not all in the frame, but enough of an idea to give a sense of realism to something more than just the main story line.
Sorry- if you couldn't tell by all my posts with camo and model, I tend to ramble... lol
Just brainstorming a little. Take everything with a grain of salt of course as all of my dios are only a few stages past yours, and I have yet to actually complete my first.
But again, looking good!