Skill level depends partly on available resources.
For example, there are many artists who can render a good portrait from a photo, while only a small percentage can do it from life, and only a tiny percentage from memory.
I have seen artist Robert Bateman trying to sketch something he had previously painted with extreme accuracy. Without his reference materials, he struggled on a 'stick drawing level' to sketch a simple outline of the animal from memory.
For example, there are many artists who can render a good portrait from a photo, while only a small percentage can do it from life, and only a tiny percentage from memory.
I have seen artist Robert Bateman trying to sketch something he had previously painted with extreme accuracy. Without his reference materials, he struggled on a 'stick drawing level' to sketch a simple outline of the animal from memory.


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