Nice shot with a couple of issues. You have color bandings in the mug (from jpeg?). Not sure if you can do much about this. Try compressing at different levels? Different sizes? Also you have an ugly gray frame around the shot that really detracts (IMO). Main part of shot is very nice though.
TC
what a lovely simple effective study in light. it's a good clean image - the only slight reservation i have is with regards to the tight cropping and narrow presentation of the shot. something a bit squarer might more naturally sut the shape of the cup. that aside, spiffing stuff - 8