Correction in red; stylistics in blue.

A Little Bit about Me

For many years, I've been [1] the official photographer of the Demidov State University and the Mercedes-Benz Fashion Week Russia.
I've taken [2] part in the filming of famous people: ambassadors, MPs, sports and show business stars, and top models.

I'm an adherent of classical photography, which simultaneously/at the same time is able to reveal your entire personality, and tell the story of a beautiful and high-quality events at any level.

[1]  When an action or condition started in the past, and continues until the present, use the present perfect tense.   Here is an explanation in detail:   http://www.englishpage.com/verbpage/presentperfect.html

[2]  When there have been multiple actions at different times in the past, and they may also happen in the future, use the present perfect tense.   That is also explained on the webpage I have mentioned.