I don't think I can help you with everything, but...
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Originally Posted by punarhero
1) The robot has to be able to recognize a person within 5-10 ft. of it. What can I use to do that. If there is a product I can buy, I'll appreciate if you can tell me which company makes it or from where I can buy it.
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You might be able to do something with an outdoor floodlamp sensor, or a security system motion detector. Both should be available at places like Home Depot.
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2) The robot has to stay abt. 10 ft. from the wall. What is the BEST way of navigation. The avg. speed of this robot will be abt 4 ft./sec. I could do line folowing, but rather not. This robot has to run abt. 10 hrs. a day, 5 days a week. What can I use for navigation which will minimize error, and to make the robot go and stop right next to the picture every time?
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Line following sounds like a good idea to me for this application. You could try IR beacon tracking, or laser/ultrasonic rangefinding. Placing retroreflective targets on the wall under each picture would give you a good way of recognizing when you're at the right spot.