Maybe you haven't run across one yet, but if you ask your sitter what a card means to them, sometimes they think you're trying to get them to give you information so you can cold read. I hate when that happens!

But if your sitter isn't one of those, it might be interesting to ask them what they see in a card. That's an interesting addition to the reading as long as they don't take it wrong.
In addition to what I said in that last post, I think when you're going through the deck and writing about it in your journal, it would be good to do a little research into what the card would have meant in the days when Tarot was first invented and compare to see the differences.