He certainly looks like a happy Dad! Perhaps just worn out? ;^) Congratulations on the newest member of the family...hope the little one's "First Christmas" was good for everyone!
Rough day, huh? See if you can improve the white balance next time, either by changing an in camera setting or using a photo editing program. Handsom Dad. Up the nose shots are not the most flattering of babies (or anyone else).
The sentiment is very sweet and I like the idea of it, but with the plaid shirt and the baby's shirt with the "My First Christmas" on it, it just looks like a quick snapshot and not one that's very well thought out. I would love it if there were a solid black background and the dad and son either had on maybe black shirts, so that they faded into the backdrop OR no shirts at all, and there was one source of light showcasing facial and shoulder structure.