Paint your nails with two coats of your blue polish
Use a dotting tool dipped in white polish to make fluffy cloud shapes on all your nails except one. These don't have to be perfect, just like real clouds!
Use a thin brush and yellow polish to paint straight lines radiating from one corner of your nail. These will be the rays for your sunshine!
Use your dotting tool dipped in yellow polish to cover the corner you left bare with a half circle. It's okay to cover the ends of your sun rays, this makes it look a little neater.
Finish with a shiny top coat!