My first concern: well or good? My second concern: Why don't they write it in simple present? You look well !
Good is always an adjective and never an adverb. It never modifies a verb but it generally follows a linking verb serving a subject-modifier. On the other hand, well can be an adjective or adverb depending on context.
You can use both present continuous and simple present. That's because it's happening right in front of you! (You look good/you look well).
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You can say any of them. Note statements like "You look well" is part of a more formal English dialect. It's use or non-use can signify a person as belonging to a particular social class.