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I liked that it mainly focussed on two elements of 'him'- his eyes and his smile. You imply that these are the two key parts of him, and reveal his personality. From what you wrote, this might be true!
Who is this person when he's not smiling?
I really like how you focus on the eyes and the smile, stripping down the descriptions to the bare bones. With phrases like 'more beautiful than any jewel' and 'true beauty' and 'light the way in the darkest of times', you might want to think about how you are using these more cliched words, though they don't really take away from the description.