Blossom seems quite pleased with his progress, and explains that it's also possible to place a glamour over another, as well. If they're unwilling, it's much more difficult, since their image of 'self' inherently conflicts with the image of 'them' that you're trying to project over them. It's easiest to do on the willing, especially when they have the same idea, and can line up their sense of 'self' with your idea projected on them, or when they're distracted, and can't fight it more than passively. The same can be done for objects, but then it's a conflict of seeing the object as you want it, as opposed to how you know it really is. It's fairly easy for the fae to manage this, but humans find it very difficult.