Ok, turn off ambient color, you really dont need it for this, and turn off translusunce. Its hard to give feedback without knowing what your going for and at what level. A good practice is to research into the kind of look you want, google up some photos which kinda have the same feel, show us and then people can pitch in and say how they would solve it.

I think your lighting is off, ditch the hdri for now, i think its confusing the whole thing. Frankly ditch the glass shader and just put some lamberts on so you can see what the lighting set up is like on its own. The raytrace reflections and refractions take too long for you to render for it to be a viable way of testing your scene.

Use a three point light set up. Standard set up would be one key light which is your main light source and shadow source, one fill light which is the color of the diffuse light in the space ( a blue for a bright day or the resultant ambient from bounced light in a room), and one back/ rim light which is placed behind the focus object.