It looks fine to me. It must be their monitor. I notice what looks good on my laptop monitor shows nearly pitch black on my desktop, and what looks good on my desktop looks too bright and has too much contrast on my laptop. So I go by what's on my laptop and hope for the best. No way can I compensate for other people's monitors. I can only go by what I see at my end.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi