I completely agree with Lisa. In fact, I think the #1 mistake that folks - particularly young artists - make with testing is being too "result oriented". It's going to be a while before you're really making your living as any form of a media artist. Now is the time to learn and explore and to try and possibly fail. Because you can't do any of that on a job. Jobs are when you should be result oriented. Right now you are just trying to build the first of many Many MANY books that you will have throughout your career. A favorite picture that you couldn't live without and would never take out of your book will suddenly become the worst peice of crap you've even seen in your life and you can't get it out of there fast enough. :lol

As you become more accomplished, yes, you will expect more out of your tests.

To this day I still only test with one or two models at a time. I think it's a big mistake to try to create an entire book at one shoot. I can't possibly do my best work that way. Particularly if I'm stretching myself to try something new which I usually am when I'm testing. So, I would actually say stick to one model for your first several tests. Learn what your pace is and give yourself time to get used to the rhythms (sp?) of a photo shoot. From there you can add more models if you want as you develop.

By the way, while I understand that you have to take what you can when you're first starting, bad models absolutely ruin a picture no matter what else is happening so don't settle for long.

Remember two things:

1) Your book is a journey not a destination.

2) Test up, (better than you think you can do) not down.

Best of Luck!

- Tania :)