I have installed Picasa on my wife's notebook (it's Ubuntu 11.04 on an HP Pavillion), but she'd like to switch to some other software (there are some issues with Picasa that bother her). She didn't like Gimp's interface (she's an artist, but not expert in digital images or photography — she's into fashion design, and the Gimp's GUI is too complex for her).
So — is there some other image editing software that is as easy and intuitive to use as Picasa? It needs to run on Linux. Preferably free, as we really can't afford anything right now.