Missing Before|After & Image Alt Text Attribt

Very nice interface. Works with WP 4.7.3. The plugin is missing some basic features which hopefully the developer will work on.

1) There is no text displayed to indicate Before and After. See original twenty-twenty plugin

2) More importantly, your SEO will get dinged for each image because this plugin has no workflow provisions for adding Alternative Text Attributes. Yoast WP SEO zinged images using this plugin right away. The issue was reported about two months ago but no reply from developer. Perhaps he is working on something. Until Alt text Attribute provided, this plugin is going to lower your SEO. See original twenty-twenty plugin