-there are some offsets in the sysconfg_plugin.prx use the sysconfg_plugin550.hbk in hexworkshop,. you will edit the picture sizes to 480x272 also some fade offsets and time offsets,.
(you can also redirect other languages to the english images so you have the english images show up in all language's,. this can be done in the none-descrambled sysconfg_plugin.prx)
if you want all the images to show you can use 8bit bmp's 480x272

-Also if you look at the TSENEDA p3t theme you will notice he added animations these can be added with rcomage in sysconfg_plugin.rco