Q1. How long should the challenge run for?
1-2 months, depending on time of year like Christmas
Q2. Should contestants be allowed more than one entry?
Naaa
Q3. Should there be restrictions on size. IE: 800 x 600 etc. ?
Yes, but like others have said, make it bigger or link to larger image
Q4. What would be the best time for the entry deadline? (12 noon, 12 midnight etc)
Midnight
Q5. What would be the best time to end voting? (12 noon, 12 midnight etc)
Midnight
Q6. How long should voting be allowed? (2 days, 3 days,...)
3 days