Helmet modelling is super OK, fences look good, the far helmet is fine, something wrong with the mauve light. The helmet shadow on the car is from a light on the left, suppose is the key light with shadows on. But it seems the colour light is on right without shadow. For the rest high marks for me, a good mise en scene.

Thanks for pointing that out! That may be because the lights have different intensity and falloff (for variation and avoiding mixing the colors). The blue light on top off the car to the right has 50%, while the red to the right only has 25%. The main light (~100 meters behind the camera) has 100%. I'm not sure, but that may the answer.

Brilliant reflection work!