Again the need for better photos. Most times you need a contrast. That is, clear against very dark plain background and coloured against a plain white background. The problem with relatively clear objects is that they refract and reflect light so that features that are obvious to you, who has a three-dimensional view, are distorted into rwo-dimensional photographs. To show details of the bowl you may find it an advantage to put something dark inside the glass. Hope this may be a help.
Ross