Great Swan

The whites really look good -- but the swan needs more room -- include the feet if you have room -- and he needs a bit more room at the top

I agree with Scott. I would lose the vignette, also.

Hi Addison: The exposure on the whites looks OK, but is actually just a touch dark. Not too far off though. The image feels much too tight in the frame. The legs being cut off really distract. The biggest distraction for me is the heavy black vignette. I'd remove it.

You've done a nice job retaining detail in the whites. The dark vignette is very heavy for this subject and the greens are over saturated. A little post processing could make this a winner.

Addison,
Excellent exposure on the whites although you could actually brighten the image slightly and still have some headroom to the right. As you probably already know shooting birds with whites and blacks is easiest on days when it's overcast or early or late in the day when you can get that golden glow.
I would eliminate the vignette as others have pointed out although I do see what you were trying to accomplish by using it. You might try for a lower perspective next time so you are not shooting down on the bird. Also, the cropped feet right at the ankle detract from the image. If you have more room I would add the feet back in on the bottom and add more canvas to the top, bottom and left side of the image.