Not sure which direction is better for the shape of your face? If you follow an imaginary diagonal line between the outermost edge of your lips up toward the centre of your ear, you’re sure not to go wrong.
As for colours, translucent shades are best. Soft rose, peach and coral are all sure bets and are available in both subtle and more punchy shades that don’t run the risk of adding too much colour on top of your bronzing powder.
If you’re wearing illuminator, be sure to avoid very iridescent finishes: you want to have shine but not too much!