Nail art is only limited to your own imagination. Because the designs in nail art are now so varied and numerous we no longer offer the course. It is now best learn't off you tube.
All nail art designs need to be commercially viable in that you must be able to complete a full set within 20 minutes unless you price the design to reflect the time needed to complete.
It is a good idea to have a board made up of your own favorite designs so that your clients can see what you can do and to help them choose what will be good for them. You will find that your clients love to see your designs but will usually go for something quite simple. However your designs board shows you are a professional and very capable and skilled.