The face & pronotum markings (together with the faint elytral line shape & placement) & the subtle difference in colouration along the flange make me want to say this is Paropsis atomaria. However, they generally have a faint pair of darker dots halfway along the elytra toward the midline and another pair toward the posterior elytral midline (sometimes joined by a faint line, sometimes not) which yours doesn’t appear to have. This makes me hesititant to Verify it to Species-level given these subtle differences can often mean a different species. That being said, I have also seen a few photos which also lack the dots but I’m not confident enough to say they have been identified correctly in the first instance to use them as a comparison (though they may well be). I’ll tag @martinl as he is a guru with Chrysomelidae, but he is also very busy so may not see my commentary (but here’s to hoping). In the interim I think it’s a pretty safe bet for me to Verify this to Genus-level for you😊