It's weird.

Since you have the marriage certification, it's enough. Any picture at the time of your marriage certification date could be considered as wedding pictures. Nobody can require you to have a defined wedding style. Why got your brother-in-law invovled? I guess the visa officer decided to decline your hu*****and from the moment that his brother was involved.

By the way, your hu*****and shouldn't have another nationality. He is just a minority (Korean) Chinese.