Improvements

[Andrew365]

Any suggestions to help make this mug look more realistic? I would greatly appreciate any advice.

[Eugen Fetsch]

Try a different lighting. It looks like the standard KS HDRi.

[germannick]

Add some very light "inferfections" to your material such as spotyness, discolorations, smears. Because renderings make everything too perfect.
Also, uses different bump map. This one does not work für ceramic nor polyamid material