Weren’t there artists at that time who could draw humans for what they actually looked like. For instance, look at the paintings of kings from the 17th Century or before.
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The purpose of art isn’t always meant to be accurate and realistic. The Renaissance really saw the growth of art method and the adoption of styles that closer replicate real life, including professional studios and guilds, the use of models, perspective drawing, paints and oils, etc. There’s a huge difference between the work from someone who is a full-time painter who learned his art from a master over many years, and a monk who spent years copying out the Bible and adding caricatures in the margins.
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