Commas with both, including, and among which
Could someone, please, check if the commas in the following sentences are correct?
1. The book includes illustrations by the famous Russian artists, including A,B, and C.
2. The book describes political situation in both France and Spain.
3. The book features stories by the Russian writers, among which the most famous are A and B.
4. He left for Paris, where he was warmly welcomed by his long-time friend Maria and her husband, a famous Belgian writer, A.
Thank you so much!