Using PClinuxOS here
A couple of suggestions.
ImageMagick comes with a viewer - use display on a command line. This one will be in your distro repo.
or and it was mentioned in an earlier post there is a viewer application from the same place as XnView - Nview.
might / might-not come bundled with XnView / be in your repo. Certainly both XnView and XnViewMP are in the PCLOS repo. If not, easy to install, get the tar file and unpack. Pop the binary into usr/bin. Again it is command line. It would also be worth looking at XnViewMP as a graphics file viewer/manager. I have been using it for about a year, still beta but very stable.
http://www.xnview.com/en/downloadunix.htmlI call either from my file browser, on a right click context basis. Probably use nview more than IM display.
FWIW screenshots
http://i.imgur.com/5MKdV.jpggood for psd files as well.