The appearance of images depends on whether you used image tags in your master page, or
not. In the first case, make sure you entered the correct path to the image you want to apply. Take a look at the sample:
An alternative way to apply images to your page is by the Image widget.
If your images are applied in your css styles to elements with specific id or class, make sure you have those classes/ids in your master page.
Also note that Images folder is reserved for Sitefinity, so using it may cause issues. Try naming the folder differently to prevent that. You might find this discussion
relevant to your problem.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items