Kevin, thanks and well done for sharing your first attempt at the hair spray technique, especially as you say that you felt some trepidation about attempting it at all! Having spent the time building the kit and then applying the base colour, it is always tempting just to play safe for fear of ending up with something that you don't like.
I must say I think you have been somewhat daring as well to use dark grey as the base colour, although I am not necessarily saying that it is wrong... You have included some nice touches and details however.
This would be very nicely complemented by some figures, maybe some ground work?