Is it proper to say, "our mind" or "our minds" as each person has one mind; or is it considered collectively?
Solution 1:
In general each person has a mind ("a mind of their own") and so when talking about many people there are many minds involved. You should use the plural.
Our minds were drawn to the pictures on the wall.
The only time we should use the singular is when we are talking about an organized group that is considered to think and take decisions as a unit - for example a panel of judges, or a prize committee.
After we have considered all the evidence, our mind is made up and the defendant is found guilty.