Not bad at all for a first image. I know mine many years ago were not nearly as good.
I hope you don’t mind I give some advise to get better results:
first of all the image is too green, a color adjustment to give it a more natural color, or conversion to greyscale would be more pleasing to the eye.
I notice a few clipped highlights. Sometimes hard to avoid. for sure try to avoid them during capture. Does iCap have a live histogram? If so pay attention to it and make sure the brightest parts do not get above 80% or so. That also gives you some headroom during processing.
I notice there is still a fair amount of noise in the final image. How many frames did you capture? And how many of those were in the final stack? The more frames (provided they are of sufficiently high quality) in the final stack the more noise will be reduced.
It for sure looks like your data is pretty good. With working a little bit on the processing skills I honestly think even more can be pulled out.
thanks for sharing