Answer the following question in 3-4 complete sentences. Name the artist and painting above. How has the artist used space effectively

I think you mean this picture .This painting is called:

The Raft of the Medusa by Theodore Gericault.

The artist used his space effectively because every part of his painting is something important to the picture, like the waves in the background, the clouds, etc. In other words, there's no spot in this painting that doesn't mean anything/have a purpose.