The doodles should be symbols or series of symbols and the descriptions a dictionary entry or a translation for the symbol(s).
Even if a doodle does not look like a symbol, you should still interpret it as a symbol. And sentences should be interpreted as symbols. If you can understand the symbols, you can just say what they mean, if you don't understand the meaning you can guess. Try to avoid just describing the doodle/symbol as what what is drawn without trying to understand/convey the meaning behind it. E.g. "Sadness" > "Crying emoji face".
Emoji, your own conlang script, a historical script, an existing conlang, a painting with symbolic meaning, symbolic math function defining the description, some scribbles that look like they could be text, all ok.
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