I have updated the Shutter packages for EL6 and EL7 the other day. You may notice some improvements and a few UI changes (nice icons).
To install it you need EPEL and nux-dextop repos on your system. Check this page for how to do that if you do not have them already:
http://li.nux.ro/repos.html
Once that's done, just:
yum install shutter
Enjoy!