Hey Robert, nice start! To my eye (being wary that colour is a tricky and often subjective topic), they appear to have a fair bit of blue in them, as highlighted by the histogram in Astrobin. Eta is bright enough that the reds and pinks often show up pretty well in DSLRs despite the H-alpha line being in a lower sensitivity region for the sensor.
A first question is whether the white balance was set to Daylight? Sometimes other white balances alter the colours unexpectedly. If you have the raw DSLR files this can be altered before stacking. Otherwise, you could maybe try fiddling with the channels to bring out a little more red (using Curves), though that can lead to unintended consequences in colour balance of the rest of the image.
But you'll see all kinds of colour renditions of objects, and it leads to arguments as to whether there is a 'right' colour balance (and that's more complicated than many would think as the 'right' colour depends on the differing balance of colour sensitivity in your eye, DSLR or CCD sensor) ... so go with what you find pleasing for whatever reason!
Enjoy your new toys
