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A good start Graham. Overall quite good.
But 6 minutes is too short for narrowband imaging. As a result your image is a tad noisy. I suggest 15 minutes for Ha as a minimum (as long as your tracking acurracy allows it). The problem with narrowband filters is the camera has the same noise floor as usual but now you have far less signal being recorded to get above the noise floor in order to achieve an image. Longer exposures compensates for that and that is why narrowband imagers go for the highest QE and lowest noise camera and use 15-30 minute subexposure times.
There is some distortion around some stars in the Ha black and white. Did you use the minimum filter? Or deconvolution or some sort of sharpening?
Greg.
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