There should be more colour in the stars.
I took a single 300sec exposure of this region some years ago using an unmodded 40D as an experiment.
The result is here
http://www.iceinspace.com.au/forum/a...5&d=1210080801
My pic isn't great but there is lots more colour in the stars than in yours. The scope is different but this shouldn't make that much difference.
Not sure why but there is something up with the processing.