Mogul Background Change
Design and Skin Customization
Hello,
Try resetting the image cache and template cache.
Image Cache
ACP > Core > Image Support > Tools > Reset Image Cache
/image/cache_reset
Reset Cache
ACP > Core > System Core > Tools > Reset Cache
/core/cache_reset
Also, while developing, you can set your site to developer mode and not worry about cached pages and images.
ACP > Developer > Developer Tools > Global Config > General Settings > Run In Developer Mode
/developer/admin/global
Hope this helps!