Hey there, @chloroform gave some good advice, i suggest to follow it if you wish to receive votes from the steemstem community.
Make sure your iamges are referenced properly, and the are free use; not copyright. Here is an example:
Image credit:-wikimedia
It's also good to ensure that the images are not protected by copyright and are fair use images or creative commons. I like to take my images from wikimedia, they are usually exactly what i need anyway. I hope that helped.
Check out some of the successful writer of steemstem, such as mine and @chloroform. Take some time to write good posts and you could see good votes in return.