I applaud your skills at being able to make a very realistic looking collage and then being able to photograph it in a way that does have the appearance of "real" space.
The composition is good. Colours work and it is just soft enough on the focus to create the illusion of being very far away.
I'm a afraid that is all I can really say. You made a very good job of this technique.
Very much has to be a telescope shot. Looks like the cover of a space mag. Of course nothing is in tight focus and does not need to be either. Is that a real comet going through or an airliner or something going over. Very nice work. I can imagine that these are particularly hard to photograph.
Interesting that I just heard this week that Voyager I has (or is about to) crossed the point demarcating the Sun's sphere of influence, marking humankind's first official incursion into interstellar space. So good of you to take the time to travel out there and document it for us.