I notice it's common in sticker art
It's chararcteristics are solid strokes, contouring lines and solid shading.
It almost, but not quite, looks like newspaper style type ornaments that consist of lines due to electrotyping.
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Sign up to join this communityIt looks like a woodcut or a vector drawing mimicking one.
Searching for terms like "floral woodcut" or "woodcut flower" gives similar results.