"More observative" is not a correct spelling of this word. The adjective form of "observe" is "observant," which is pronounced /əbˈzɜrvənt/ (uhb-zur-vuhnt), with emphasis on the second syllable. It means "watchful" or "perceptive." "More observant" could be used to compare the level of observation between two people or situations. It is important to use correct spelling and pronunciation in order to effectively communicate meaning and convey professionalism.