I agree with Airhead. I like the "Marines in a Hurry to Paint Word" style as it brings out the not so perfect side of the Marines. The green is spot on, although highlights are missing, but its a suitable base coat. The pieces fit well and that's the thing I can't get right!
Not bad for a first - even a bit of freehand. If you are comfortable with washes, add some dark washes to it to bring out the panel lines. Another option is a Micro Pigma pen in .01 or .005 to outline the panels with. Will help the score greatly.