Two things - first is the specular value is way too high - you can lower it either of two ways - 1) set the specular color to dark grey and leave the value at 1 -- or 2) Leave the color white and set the value to something like 0.05, 0.1, or 0.2 depending on how "shiney" the material is. The other thing is texture detail (see attached image) - Firefly lets you adjust the detail (crispness) of textures so that you can balance render quality with render time (higher quality takes longer). Lowering the value of the Minimum Shading Rate parameter will give much crisper detail in your textured objects, but does little or nothing for smooth color-shaded objects. Hope this helps.