I wear Mary Kay powder foundation that semi helps with my not-so-beautiful skin, but I want some more coverage. My face is oily but dry/flaky at the same time, and I have tryed some liquid foundations but they make my skin more flaky even after putting on moisturizer. Also, my face gets really shiny with liquid foundation (with a powder finish), so should I use foundation and apply powder throughout the day when my face looks shiny? or are you not supposed to do that?