Sketching is not communicating.
Or at least, not where “communicating” means “transfer”.
I cannot look inside your head. The only thing I can see is the sketch. It is a public construction. One that I and you may have different mental models of. But the sketch, the model, is all there is.
You might say that you weren’t able to accurately express what you had in mind. But that tells me nothing, except that you judge the sketch to be a bad or incomplete proposal. Fine. Make another proposal. Change it. Develop it. Iterate. Or make it explicit (and public!) what it is that you find unsatisfactory in the model, or how your ideal might differ from it. Because again: I cannot magically look inside your head.