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A couple of things to try. Remove the Finder preferences file. The system will automatically regenerate it. In Finder, press Shift-Command-G and enter ~/Library/Preferences. Then find com.apple.finder.plist and move it to the Trash. Right-click on the Finder icon in the dock and select Relaunch. If this doesn't work, ensure that JPG files are associated ...
When a file is not associated with a specific application, it will not show as Icon. To change that right click on one of those files and select the Get Info, in that window select the Application to use to open, and then select apply to all (Change All).
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