I'm honestly impressed by the amount of ways that Demi Lovato has managed to add more character and flair to pretty much every French manicure she's ever worn. The singer has spent the last month on tour following the release of her ninth studio album, It's Not That Deep , and it's almost like the on-stage manicures she chooses to wear get better with each performance. Last month, for example, she remixed the classic design by adding silver chrome to her fingertips instead of traditional white, and for some of her most recent tour stops, she pulled out a look that was even more extravagant than before. This past weekend, Lovato performed for audiences in San Francisco and Anaheim, and shortly after the shows, her manicurist, Natalie Minerva , shared a close-up look at her manicure details via Instagram.…