See my generation guide for some tips and tricks to getting what you want.
You can use both simple prompts and complex prompts, but I would suggest specifying the level of detail for best use.
I've mostly used this to create models but you can create objects / food / landscapes - whatever. I haven't tried everything, but for the most part it does a fair job of creating images.
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Its good at creating real things. Not that good at concepts or unrealistic things.