Because the reader needs to be able to understand what he/she is talking about.
The things that could be observed from a painting are that it is a <u>portrait of a man</u>, it shows<u> visible brush strokes</u>, and<u> displays bold colors</u>.
Even though there was no attached painting, we would be able to see these things within the painting. You can see what is contained in the painting, how it was painted, and what colors the painting is. However, you can not see when a painting was created or know that it is part of a large collection by simply looking at the painting.
Context clues are the details in a sentence that helps you figure out the meaning of a word. Hope this helps!
Answer: The tinkle of the raindrops echo in the heart of the poet as if his heartbeat responds to every sound of the rain by its rhythm. Moreover, the rain kindles many memories in the poet's mind and he gets lost in dreamy imagination.
Hopefully this helps.