Occasionally, children - and adults will say that they have no artistic ability (ok usually adults) - EVERYONE HAS ARTISTIC ABILITY - you just have to know it when you see it! hahahaha yes i know that sounds just as difficult but here's a thought just take what you enjoy doing in life and make it in sand.
one mom did just that saying that she has no idea what she was doing and then proceeded to make a perfect baseball with the Texas Rangers logo and then she told me when i asked who had done it
"oh i know nothing about art - but know a lot about baseball"
Follow your heart when creating art as it will keep you interested and let you learn more - at a faster rate but what is the key to success? Practice.
Ninja's practice for years, just like sand sculptors, some make it to the top and other become fine swordsmen, but not Ninja's.
"so when will i am a ninja master?" When you begin to teach others what makes you passionate about messing about on the beach.