Not able to take image in title

1. are you pasting this in ‘visual’ or ‘text’ mode in the editor?
2. can you share a link to the page so we can see what (if anything) is being output in the source code, if you have any js errors on the page, etc
3. on some servers, shortcodes do not like html in the attributes, so first thing you need to do is verify that a plain vanilla expand is working on your setup:

[expand title="trigger"]hidden content[/expand]

if this is working then you can try the roll-your-own method like so:

<img src="https://mydomain.com/images/falcon_girl.jpg" class="collapseomatic noarrow" id="some_id" title="Hover over Trigger Text">
<div id="target-some_id" class="collapseomatic_content ">Target Content</div>