Images are not being scanned in Kitkat
Many media scanner apps do not work as expected on KitKat. After trying couple of such apps i found that the media scan function in FX file explorer app works 100% every time you use it. It successfully updates your gallery with the changes.

Get FX file explorer from here:
https://play.google.com/store/apps/details?id=nextapp.fx

Open this app, go to 'Main Storage' &amp; run 'Rescan Media' from menu.

Tested on Nexus 5,
Android 4.4.2