The image certainly shows some promise. If you are working unguided you will need an awful lot of relatively short (20sec ) images to raise the signal to a point where it is above the background noise. You would do better to image some of the brighter targets with the shorter images. Targets such as Omega Centauri, 47 tucanae, Lagoon nebula, Trifid nebula, Swan nebula etc will give you much better results on shorter exposures. You will still need a lot of them though.
Good luck and keep at it.
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