As you say, it's a concept, so I can excuse the rough edges on the lines. The inky layout is really good, however I've noticed a lot of dA and a few NG artists using space telescope pictures as backgrounds. I've been guilty of it myself, though I did what I could, to make as much of it, my own by tweaking and adding to it...
On wide view, it looks like a background bright star cluster, forms above where his/her left hand would be. That makes me wonder if it's close enough to be smoke, vapor, a ghost of a hand? It's a very appealing image with a few rough edges.