My guess is that instead of printing your artwork onto clear acrylic faceplates (including printed black background), they may instead have not printed any black background but just printed the red graphic onto very dark smoked acrylic, to match the dark acrylic of the rest of your shell. If so, that would explain why the red is so lacking in 'vividness', particularly if the printing was applied to the inside of the faceplate, though this is unlikely - I would anticipate the printing being applied to the
outside of the faceplate, with clear lacquer subsequently being applied on top, to seal the grapic.
Look at position 4:30 in the following clip, to see what I"m on about:
An alternative method of artwork is demonstrated at 7:53 in the next UE clip (but, as far as I'm aware, at the present time,
UM use
printing, rather than laser-etching, for their custom artwork).
I agree that I wouldn't be happy with your artwork as it is. Did you provide the artwork with black background or did you provide graphics in pure red, with instructions to apply this to a completely-black physical shell? Either way, your graphics deserve to pop-out more than they do, but I'm just curious.
Personally, I do think your discontentment is reasonable, though I don't doubt that UM had the best of intentions in doing it the way they did. I'm sure Yusuf and UM both wish you to be happy with your purchase, and will do what they can to ensure this is the final outcome.