The most notable difference is that Naturalism focussed on creating realistic interpretations of reality with subtle, soft rendering as impressionistic paintings focussed on capturing a slightly more abstract interpretation of reality based on 'feeling' and artistic portrayal, often featuring visible brush strokes which was a controversial technique at the time of the movement.
Answer:
The Mid eval era
Explanation:
It is not in the options tho... This piece of painting is an example of the mid eval era.... Sorry if I didn't help