If the center were, well, centered, I would think it was perfect.
I feel I must say something... Forgive me please.
The chevrons on the stargate are evenly spaced, not crowded on top.
I did study the official "Stargate" before making this one, and decided what aspects of mine should be different for my story line.
Thank you for noticing the differences, though, and feel free to point any more out. They might not be purposeful changes