Here in this post you can find in steps how to make the bow.
It is easy just follow the steps.
After you paint the nail in colour you wish, on the ring nail outline the bow with white paint or polish. Then cover it with with glitter. If you wish you can outline it with black paint or you can leave it as it is. I tried both ways and they were nice.
These are the final looks. You choose which one you like most.