I like to make creative images like on happy new year and other topics. It's a fun thing to do. 

I had a WordPress blog and I used to get a lot of visitors: once it hit 10,000 a day. So I applied for Google AdSense. I got rejected and the reason they mentioned was "Too little content". At that time my blog had 200 creative wallpapers created by me.

Then I purchased a domain name and set up my website on that and now I have a big collection. I want to apply for AdSense so I Googled and found many helpful articles about what to include and what not to. I made those changes but there is one particular thing that I am seriously confused about. 

Everywhere says "content is king". You should have 400+ word articles. But I don't write. My website does not contain written articles. It has creative wallpapers which can be used commercially or non-commercially.

When Google rejected my blog for too little content, do they mean that only 200 wallpapers is not enough and I should include more? Is it saying that I should write articles on each wallpaper or post like 400+ words?