The letter comes across as too flowery to be credible. Based on what you list the candidate is strong enough not to need this. What would help more is the following:
1) you might want to mention your own credentials, position and what your company does.
2) I did not find this an impressive opening:
There is a great proverb "Face is the index of mind". But, this proverb is not applicable to XXX, because his appearance look like a fresh under graduate, who has just passed out of college.In contrast, he is young dynamic professional.
Better use the space to cite good examples of "incredible initiative and a strong dedication" and state what he did to get promoted from starting position to team leader.
3) Aside from research and analysis, what was his key achievement? Some unique trait and more personalization would help. I still was not convinced by what you wrote at the end :
In my years of work experience both in academic and professional world he is one of the finest person with whom I had worked
Why is he one of the finest ?