Tip #4: think about the design
It has been proved, people prefer beautiful things. Your contest will not escape this rule: the graphic appearance will be a good way to success, without overshadowing of course other criteria such as the prizes, advertising, etc…
So treat your design, upload images in high definition, be creative. Similarly, showing the prizes in the skin is very visual and gives your participants an incentive to enter. Give a special place for your first prize, make it attractive.
Match up the whole design (tabs color, bottom), use pleasant colors (no flashy colors, marrying well). Have a background color if one of your tabs (participation, earnings, etc.) has large variations.
Include a simple editorial. Be powerful! Feel free to get some inspiration from other contests hosted by Kontest, some visuals are great!