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You may also move Epilog/Prolog to the Show statement itself, if this seem more logical. Like this:

Show[{
image1,image2,]]> Feb 13, 2013 4:48:07 AM Feb 13, 2013 4:48:07 AM Alexei.Boulbitch@iee.lu 0 http://mathforum.org/kb/thread.jspa?messageID=8300683&tstart=0#8300683 > With the Show statement Mathematica picks up the Options]]> Feb 11, 2013 4:36:30 AM Feb 11, 2013 4:36:30 AM alan.isaac@gmail.com 0 http://mathforum.org/kb/thread.jspa?messageID=8293245&tstart=0#8293245
All of which brings up a topic that confuses many users doing graphics.
There are two kinds of Options that affect the look of a]]> Feb 10, 2013 3:35:37 AM Feb 10, 2013 3:35:37 AM djmpark@comcast.net 0 http://mathforum.org/kb/thread.jspa?messageID=8293246&tstart=0#8293246 ]]> Feb 10, 2013 3:35:36 AM Feb 10, 2013 3:35:36 AM 2 http://mathforum.org/kb/thread.jspa?messageID=8281645&tstart=0#8281645 > Show[
> RegionPlot[
> {6 <= x <= 13, 19 <= x <=]]> Feb 9, 2013 12:43:25 AM Feb 9, 2013 12:43:25 AM alan.isaac@gmail.com 0 http://mathforum.org/kb/thread.jspa?messageID=8281646&tstart=0#8281646 ]]> Feb 9, 2013 12:43:24 AM Feb 9, 2013 12:43:24 AM 4 http://mathforum.org/kb/thread.jspa?messageID=8281647&tstart=0#8281647 ]]> Feb 9, 2013 12:43:24 AM Feb 9, 2013 12:43:24 AM 6