Yeeaahh, Tintin fanart! They look great in your style! Been a fan of the comics from being a kid, I looked forward to the movie so bad, but was a little afraid of it (if they had changed a lot) but I loved it!
According to Herge, who said in an interview once, Tintin will be like 17, though he first pictured him to be 14-15. But teenager can't get into a bar or live alone as a freelance reporter can't they. So he made him a little older.