The context is a painter's work analysis; but the sentence is somehow independent. "At its most oscure, the painting has some of the features of Far-Eastern imagery." and then the author starts talking about other things...
Thanks and excuses for my inaccuracy
Difficult to be sure as your sentence has errors, and we can't be sure what it really says. Is it "the painting has" or the "paintings have"? If the latter, I agree that it is odd as for the reasons already stated. It might be best if you were to go back to the text and copy it exactly, because what you have copied is certainly wrong. Also, the sentence before this one might be helpful.
I really appreciated your clear explaination. I think now that the meaning is something like: This feature is not immediately visible but at a smart look we can realize that the painting has somehow been influenced by Far-East imagery
Thank you very much