Is having one of my new year resolutions to be more beautiful or just beautiful silly?

No it's not,especially if the beauty you seek is for yourself. This journey could result in your definition of beauty broadening and you recognizing beauty within yourself that you've otherwise ignored for years,a beauty that when brought to the surface through introspection could radiate to others because of the impact it will have on how you carry yourself and consequently how others perceive you.

Use the resolution to just be you and accepted for who you are. 🙂 I'm certain that you're quite beautiful already.

No. You know what you mean specifically but it could be defined in many ways: dressing up every day, rather than on special occasions, but even doing more things for others and being especially kind is being beautiful. 😊