1. He was based on mountains and rivers, so he painted a lot of beautiful pictures.

Question

2. He was based on the scenery, so he could paint many pictures containing mountains.

(Are they correct sentences?)

Answer 1

The use of "based on" is causing problems. Here are better ways to phrase these sentences:

1. He had sketched many mountains and rivers, so his paintings were quite beautiful.

2. He frequently sketched scenery, so he could paint mountains well.