Then use your nail art brush and a contrasting, opaque polish or acrylic paint to draw a few circle shapes. Spread them evenly on the the surface to make a nice composition. Then divide each circle in slices and round the two outer corners of each slice.
Clean your brush (or use a new one) and use a third color to surround each circle shape with a line. Leave a small gap between the circle and the line if you can. Then fill in the gaps with the same color and let the whole nail dry for a few minutes.
The surface is still a bit bumpy, so to make it smoother and protect your design, apply a topcoat. At last clean up the excess polish on your skin and you've got yourself a fresh and juicy design ;)
Check out the tutorial page for more useful tips. Also I would love to see your attempt on my design, so feel free to leave a link to your creation in the comment section!