Gpicview is a simple image viewer for the light-weight XFCE desktop. It allows you to view images and do very basic editing like rotating and flipping images.
It has one fatal flaw: You CAN NOT open images in other applications from within this program. This lack of ability to open viewed images in GIMP directly from Gpicview is a TOTAL SCANDAL and it makes gpicview a terrible image viewer.
Eye of Gnome is a better choice.