Does feel major, those two together. The Empress can be about growth and develoment, like tending to a garden, bringing things to fruition. She indicates patience and creativity, nursing a young project until it can leave the nest.
Given this with the Wheel--about luck, expansion and change--I would say that some small project or business or new venture, if nursed and cared for, can become something major. It might not appear so now, but whatever creative idea (or whatever) is starting, it's going to make everything different. It's going to turn the wheel.
I'll give you an example. Think of the "Harry Potter" stories. A woman tells these stories to her kids. That's how they start, very small, nothing special. Then she writes them down. Then she tries to get them published. They come out as a book...again, nothing special. Just another kids' book...but once they hit the readers, it takes off. It grows and grows and grows....
Until suddenly it's weight is making that huge, creaky wheel turn. That one little book changing the whole book market. Not just kids books, but best sellers lists, publishing. This little thing, that seemed like nothing, has turned the wheel in a big way.
I think your person's "head" is on the verge of a major "turn of the wheel." Something very small, if nurtured and encouraged to grow, could really transform their whole way of thinking, and bring them up from low to high. So like the Empress, they must take some small creative way of thinking and tend to it. Even if they think it's nothing. Because if it's allowed to become what it could become, it will make a huge difference.