Super nice colors.. I like those kind of pieces in real stained glass; what you you have on outer edges.. like jewels of glass- faceted or rounded pieces.
great job! Though I do agree with eishiya that the thick lines on the circle in the middle are distracting, you might want to take a minute to fix before voting starts.
The thick lines on the circle in the middle are rather distracting, I had a hard time seeing the dragon and the knight because of it. I think thicker outlines on the figures (just on the outside of them to help "group" them into entities, like in most real stained glass art) and a thinner outline on that circle would work better, while still keeping the circles a big part of the composition.
Beautiful combination of colors!