How can I make the reflection in this glass brighter?

[noah_davis1]

I'm trying to make the reflections in this glass more noticeable from outside, and I'm finding that the reflections, while visible, are quite dark compared to what they're reflecting. I'm wondering if there is a material setting I should change or if it's more a matter of the area itself being too dark?

[Pixelcon]

try increasing the material IOR. That will bring it closer to a mirror the more you increase it.