Here's a direct application of the KISS rule in anything art/design related - it equates to: KEEP. IT. SIMPLE. SILLY! (or STUPID, whichever floats your boat).
Minimalistic approach is another way of putting it and sometimes when you got one very good piece of artwork try to use to your advantage with white space. Just keeping things simple like this can look just as beautiful - it only took me less than 10 minutes!
Thanks Mary Kelly, you've been one of the really cool lecturers I got for Graphic Design this year.