Here's your design with finishing effects, including a couple of closeups for detail. We've made two versions; the first is accurate to your earlier mockup, and the second has a texture in the black background. We also tried a pale blue center in the second. We think the yellow center is warm, energetic, and blends with the other yellow elements. The blue center is cool, more reserved, and blends well with the blue background of the badge.
Aside from that, the images are exactly alike. The knotwork and lettering have a gold-metal look, with a small drop shadow to give them dimension. The blue badge has a subtle texture, and more emboss, shadow, etc. have been added where appropriate.
The pre-finishing mockup is posted at the bottom.