Of course, painting on the beach is a dubious idea. But still, if you cannot imagine your vacation without makeup, observe at least basic safety techniques, otherwise there is a great risk of looking ridiculous (and this is putting it mildly!)
Invest in a good oil-free primer and base cream. In the heat, makeup tends to spread, so you cannot do without these products (yes, since you decided to paint on the beach, you will have to do everything according to the rules).
Do not forget about lip care: in the summer they suffer from all kinds of thermal shocks and temperature changes. Be sure to put a scrub and moisturizing balm in your vacation bag. By the way, as for lipsticks, here, surprisingly, matte lipsticks work better: they are more persistent and reliable.
We say a confident "no" to the shine: in the heat it is not the best option (and even the hair sticks to it all the time).
Try replacing your foundation with a tinted moisturizer (or sunscreen).
Do not apply eye cream to the upper eyelid: this way the shadows will definitely not last long.
If you decide to make an arrow as well, be sure to fix the line with ordinary black shadows, using a beveled brush.
Finally, remember the less is more principle. Believe me, it is especially relevant on the beach.