The ownership on the files is probably incorrect. The quickest way to correct the ownership issue is via Terminal.app. Since you've moved files from one user account to another, I'm assuming you have administrative rights.
In a Terminal, issue the following command to change the ownership of everything in your Pictures folder:
sudo chown -R /Users/<your_username>/Pictures
More Detailed Instructions
- Open Terminal: ⌘SPC and type Terminal. Hit ⏎(enter) when you see it highlighted.
cd followed by a space on the command line you are presented with
- Open up a Finder window and drag the problematic folder to the Terminal window to insert the path. Hit ⏎
- Assure that you are in the appropriate directory by typing
pwd⏎. If your expecting to be in your Pictures folder, you should see
sudo chown <your_username> ./* and hit enter. Replace with your short username (i.e. the name to the left of the