You're welcome, @thegreatlife :)
#steemstem is used to get my work noticed by the @steemstem team; a group that focuses on promoting scientific content on Steem(it). #busy is to get an upvote from http://busy.org/ because I use that site to blog from instead of Steemit (it has a much better layout in my opinion).
I am pretty sure your content is good enough to be accepted as a member of @qurator, but they might be asking you to start crediting your image sources :)
Best regards from @valth
Is it acceptable to use google search images so long as I mention the author?
It all depends on the image I suppose. Some people allow their work to be used with credits, while most images cost money to use on a website, and especially when the post is for-profit. You can read more about what @qurator thinks of the case here.