Thank you for your encouragements, it is more motivation for me.
Without the star incorporated, it would be perfect...
I tried to delete the stars in the picture because, you know, as the nebula is not a perfect flat model, there are some minor distorsions of the picture and mismatchings when seeing from earth stars and nebula together.
The main problem when using a clone tool for erasing the stars is that the job is never perfect enough from my point of view.
Maybe you can help me ?
I think the mapping projection on the model could be done differently to prevent distortions, but I'm using Anim8or and functionnalities are very limited.
Any idea or advice ?