This is a particularly lazy example of an amateur designer using another living artist’s artwork to make their own work look better. If the artwork on the right was hand-drawn and only INSPIRED by the artwork on the left, I’d have less issue with it. But due to the fact that the design was copied and pasted into digital software and only slightly adjusted, it’s a definite case of plagiarism.
Note to designers: You can use old art and posters from before 1920 as it falls into the public domain. A movie made in 1976, though, is still the property of someone and you can’t pilfer movie poster websites for your own gain. Especially if you are just going to take elements from them whole-hog.