Hi Willi,
i like your built! Yes, there are some shiny spots on the armor. It could be the exposure of the photos or the incidence of light. If necessary, do a light wash over it again and the problem is solved. RAL 7031 is actually also the right color. Again, it can be due to the camera setting or the light. Did you use a semi-gloss clear coat? You don't actually need it on your backpack. Just take pictures in indirect light or in the shady area (not too dark). Although I think it's because of the camera setting when you look at the lush green lawn and the bright red. I think the pack is well built, great work.
Regards bigwam (Thomas)