It looks like you're new here. If you want to get involved, click one of these buttons!
Did you want feedback, @sam_storm?
Could it maybe be the temperature of the cast shadow from the jar? It's a warm shadow which means the light source would be cool. The other thing to check is the value of the shadow. It looks slightly darker than the background behind it but is that the case?
This looks good. The vessel has solidity and its shadow and the background work well quite well from what I can see. It's difficult to see clearly because of the shadow of the easel on the painting and the noise from the studio behind the easel and the distortion due to the camera not being straight when you took the photo. It's best to crop photos before posting so that your painting is presented in the best way. Your painting is probably better than it looks in this image.