Fresh mind gives you a new scenario to the same project , a new way of approaching to the same problem , a new way of projecting your thoughts rather than the usual approach of a trained mind.
To get a new look we change our accessories(mobiles,clothes, specs,shoes,watches etc) and we do add something extra if missing. We desire that the new look designed by us should be distinct-able , different from the majority. All we do this by our own ideas , our own thoughts i.e. we are not trained for this and still we get a better look. We have trend setters i.e. they get a look and we get trained to that look .
Fresh mind can think of new ides, a new approach to the same issue rather than a trained approach for solving the same issue. Definitely, the trained approach is going to solve the problem but trying something new i.e. trying your own approach may solve your problem a little more easier. Success can be achieved by a trained approach but it can be solved much more easily by approaching it with some new ideas , fresh ideas.
An individual needs to grasp the trained approach and surely its not sure for every individual to grasp the approach being taught to him/her. In those situation , its beneficial to apply your thoughts and produce a different and more easier solution to the same problem.