i need help here with shome lighting and glass issues, wondering how to improve the transparency of the wine glass to get better shadows at the bottom of the glass. Also under the plate and im guessing everywhere needs better lighting, i have two plane emission sources not exactly 3 point accurate. Cheerio!
https://www.youtube.com/watch?v=vbj4d5XL0NA This may help so much to cover but it is fun when you get on. 
It might help to provide your glass shader nodes as well. Are you using a transparency shader, and how do you mix it ?