Pretty basic stuff to be honest Jen. Client shows you a set of existing pictures, asks you to add a few headshots to the set due to new starters, etc. Reverse engineer the lighting, pose, focal length, blah blah blah, however normally do a far far better job and end up winning the contract to re-shoot all and hopefully other work. Yay!
Do you know what, this thread was really positive with everyone throwing in help and suggestions with no-one really stating anything that was troll-ish or aggressive and then you step in. You seem to know better than a man who is considered one of the worlds successful head shot and portrait photographers (probably because casting agencies want his pictures to represent their clients as they work for all parties), you started telling everyone that white background is a fad (one of my friends is a semi-retired lifelong photographer who has been shooting in the music industry since Tom Jones was young and has been shooting white background since ever as per provided briefs all around the world - London, LA, New York, Japan, etc. His friends and clients include Backstreet Boys, Culture Club to name a few, flipping long fad if you ask me), then start off on a tangent about lighting modifiers, existing shots, etc.
Blimey. Is everything alright Jenny? You are of course welcome to your opinions about things but to start poking a few of the guys on here who are being helpful to the OP in a generally quite positive thread, well not sure what to say to you really. Would also love to see some of your work as well, although everyone can post and offer their opinion regardless of level sometimes it can add a level of credence to commentary if you know someone is walking the walk as well as talking the talk. Peace and love and harmony and all that stuff.
EDIT: Don't worry, through the power of google I found your work on flickr and facebook and your website