Please check the following sentences.
1. Which word is better, "picture or paintings" in the sentences?
2. Is the phrase "to color pictures in diferent colors" acceptable?
He is a great artist. He is good at painting beautiful pictures about nature. Because he likes to color pictures in different colors, his pictures/paintings are usually colorful.
Consider these changes:
'He is a great artist. He is good at painting beautiful scenes from nature. He uses a broad palette, so his artwork is usually vividly colourful.'