One of the biggest requests I get as a makeup artist is "Can you make my lips look bigger?"
I have a couple tricks for you to make your lips appear fuller.
Take your foundation color and apply it with a sponge on top of your lips & then powder using a puff. Next use a lip liner in a natural tone following the line of your lip but just slightly above the natural lip line. Apply a lipstick color with a lip brush all over your lips and on top of the lip liner. Then apply a lip gloss that's a lighter color than your lipstick in the center of your upper and lower lips. The end result will be a fuller looking pout!