You have updated your sitecore´s version from 7.0 to 8.1 using the Upgrade Guide, and when you publish all content and open your site again you don´t see the images? Are all media calls broken?

You have missed a replacement:

<replace mode="on" find=" " replaceWith="-" />

It might bring problems at images request, when you use spaces in media item names. Add it to your section

Another thing to see is if your CustomHandler section is like this:

<customHandlers>
   <handler trigger="-/media/" handler="sitecore_media.ashx" />
   <handler trigger="~/media/" handler="sitecore_media.ashx" />
   <handler trigger="~/api/" handler="sitecore_api.ashx" />
   <handler trigger="~/xaml/" handler="sitecore_xaml.ashx" />
   <handler trigger="~/icon/" handler="sitecore_icon.ashx" />
   <handler trigger="~/feed/" handler="sitecore_feed.ashx" />
</customHandlers>

This is the same of “Configuration Files Changes” especified by Sitecore Upgrade 8.1 IR.

I hope it can help you! 🙂