Read rest of the answer. Moreover, how do you describe a bright color?
Let's take a look:
Beside above, what does it mean to be bright? Being described 'bright' is a short cut to saying above average, quick thinking, quick to pick up new ideas, quick to make connections between abstract ideas. They are also usually articulate and personable.
Also to know is, what is a synonym for bright future?
future bright
Is Beautiful an adjective?
Beautifully is an adverb which describes a verb. Beautiful is an adjective which describes a noun. In your example, you're describing the "you", a noun, so beautiful is the one to use. You're not describing the verb "looking" or the act of looking, so the adverb is not used.