This is a simple model that i did, modeling, textures and materials, the file has all images packed in the .blend, it includes a HDR image for the lighting, here is the timelapse of the process, unfortunately it's incomplete, but only the texturing part is missing.Timelapse
Your render is amazingly photorealistic. It looks like a real die-cast zamac miniature.
This model is used in our space racing game: www.spaceBerz3rks.tk