Gorgeous bird and great color in your photo. Yes, another layer of glass, no matter how clean will have an effect on the image. Even clear UV filters made of quality optical glass will have some detrimental effects.
That said, your photos turned out very sharp for being taken through a...
I love the concentration you caught on her face. For a PR shot, I'd like to see the whole child as well as the entire golf club and the ball she's looking at. Or if it's going to be in a collage, you could get away with cropping it further from the bottom and right side to center her more. If...