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the spells says...
This spell creates the visual illusion of an object, creature, or force, as visualized by you. The illusion does not create sound, smell, texture, or temperature. You can move the image within the limits of the size of the effect.
does this mean you can only make ONE object, thing, etc? LIke a wall or a rock-slide, or can you make a crowd of people? Can you fill each square with an illusionary person? Also, if you have, say, multiple people created by the spell, does that mean that if you disbelieve one of them, you disbelieve them all? if that's the case, you could argue the 'crowd' or all the multiples of objects are all a part of one, single big illusion.
"an object, creature or force"
however, complex objects like a bonfire, a cart, a mortared stone wall, etc. are usually considered a single object.
a group of people or rockslide is up to your GM.
But by the rules there are no such limitations, it says "as visualized by you", only limiting the illusion to the imagination and knowledge of your character. This could require knowledge checks to make something authentic looking. (I use knowledge checks for such things).
You disbelieve the spell, that means all of it.