When you change from one Theme Poetry theme to another your images may not want to play and may appear incorrect. This is because when you upload the images in a theme, often they are resized to suit that particular theme.
There is a plugin that you can use to resize the images so you don’t have to re-upload them all over again.
You can download the plugin here – http://wordpress.org/plugins/regenerate-thumbnails/
Install the plugin and after you have changed themes you can Regenerate your Thumbnails.
This should work for most of your images however for the larger slideshow images you may have to re upload them to the size specified for that theme.