More Restaurant Logo Tips

Distinguish your company from your competition
Don't try to copy another company. Be your own brand. Less than a decade after Coca-Cola was born, Pepsi quickly became successful by setting themselves apart rather than trying to emulate the leaders.
Use meaningful colors
Different colors and shades can have different effects on people because of color association. Green is associated with the environment and is an appropriate logo for a company like the Sierra Club or Greenpeace. However, green is also associated with motion sickness so would be a poor choice for the interior of a car.  There are websites listing the psychological effects of color.
Use an appropriate font
You may generally gravitate to bold, exciting fonts, or feminine curvy fonts but if you are a ballet company, you should probably avoid harsh, clunky lettering, and if you are a football team, you should probably avoid graceful, delicate lettering, even if it's more attractive to you.  Think about finding a rustic style of font if you are designing for a steak house.
Be simple
Your logo can have some elaborate features but it should be simple enough to make a quick statement. 
Be memorable
Your logo should make a statement about your company. The next time a customer needs your kind of business, he'll choose you just because of brand recognition. 
Avoid distracting elements
Your logo does not need, LLC, Inc, and other details. That type of detail can be saved for documentation about your company. The next time you are driving past businesses, take a look at the logos around you and see how other successful logos are handled.
Avoid tag lines if possible
Tag lines can be an important part of a company's image but should be separate from a logo. The size of the text in a tagline is so much smaller that it often forces the logo to be bigger in order to accommodate the text.