In the video review, Kristina compares the Khol Eyeliner in Jet black color by Jillian Dempsey to a brown waterproof eyeliner. She notes that the brown eyeliner looks more natural but recommends making sure it is easily reachable. On the other hand, the black eyeliner provides more depth but is messier than the brown. Overall, the Khol Eyeliner in Jet black color by Jillian Dempsey seems to be a good product for those looking for a bold and intense look. However, it may require more precision and care during application to avoid any smudging or messiness.