I think you've worked the properties of the glass quite powerfully here - both the refraction of the clear glass and the transluscence of the frosted glass. It creates a pleasing effect. The contrast with the red background works well too, as does the fade from bright red to black.
The subject does look just a little "plonked in the centre", though.
Could use a little more sharpness and possibly some contrast. The lighting makes the swan look a little flat to me. Maybe a tighter crop would work a bit better as well, but that's just me.
I like the left side of this photo better than the right side. The lighting is nice and even and the swan has a nice smooth look to it. If you could have gotten even lighting it would have improved the image. I also feel the swan is too centered.
I think you need a softener on the light that hits the image from the left, a bit harsh. Also a different background would have helped the figure stand out.
Nice piece of glass. Might have benefited from being better separated from its background? (Darker background, more complementary colour, maybe the swan raised up on something - just thinking...)