Paint you lips in Photoshop for just 1 minute.
Same technic maybe be applied to paint eye shadow etc.
Click the icon at bottom right (circled in red) to create a new layer.
Change layer mode to 'soft light', opacity to '20%' (or anything from 20% to 50%).
Click the icon at bottom left (circled in red) to enter color picker, and set lip stick color.
Choose 'Brush Tool', set brush size matches the lips, and hardness around '20%'.
Now, paint over lips with the brush. The job is done!