I would try to render everything as you see it in the source, exactly as it appears in the photo so that your end result looks like the photo. You will learn a whole lot doing that once or twice even if you don't plan on working like that in future. You will get a very intimate look at how glass works that way. Once you have done that, you will hopefully be able to transfer/translate that sensibility to whatever style you're ultimately doing.

But in yours now I like the contrast you have put into the whole -- strong lights and strong contrasting darks in the upper part of the glass. The base loses some of the transparency and reflective quality. But I do like your richness.