Searching for only text result is common on any search engine but many users very much like to have visual search. They mostly searches photos and most of the time they try the Google Image Search. And, as a result searching on a common Image Search engine is totally boring and after the launch of the Bing Visual Search, many users stared using this search. It provides very good results and images and users are diverting their mind from other image search towards Bing Visual Search.
With the Hi-Quality Image result, and perfect image keyword detection Bing is getting more popular photo search. Many of the blogger or webmasters are getting their traffic from Bing Visual Search so are looking after to optimize their photo content on the Bing Visual Search.