A few suggestions. The liquid inside the vials should not be touching the glass. Give it some depth. You need to show that the glass has thickness. Also maybe you could make the cork/plug/lid thing a bit rounder and smaller at the top. What I would do is take a cylinder with 4 slices. The top and bottom slices scale down so it looks a bit rounder. If you need more slices make more.
These remind me of the ones from WoW