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To rename images using Powershell:

1. Open Powershell and navigate to the folder where the images are located using the cd command.
2. Use the Get-ChildItem command to list all the files in the folder: Get-ChildItem *.jpg.
3. Use a foreach loop to iterate through the files and rename them: foreach ($file in Get-ChildItem *.jpg) {Rename-Item $file -NewName "newfilename.jpg"}
4. Replace "newfilename" with your desired new filename, and change the file extension if necessary.

To group images into new folders based on a common characteristic:

1. Open Powershell and navigate to the folder where the images are located using the cd command.
2. Use the Get-ChildItem command to list all the files in the folder: Get-ChildItem *.jpg.
3. Use the foreach loop to iterate through the files and sort them into new folders: foreach ($file in Get-ChildItem *.jpg) {New-Item -ItemType Directory -Path $file.CreationTime.ToString("MM-yyyy") -Force; Move-Item $file.FullName -Destination $file.CreationTime.ToString("MM-yyyy")}
4. In this example, the images are sorted into new folders based on their creation dates. You can modify this by replacing $file.CreationTime.ToString("MM-yyyy") with your desired grouping criterion.

Note: Before performing any changes to your images, it is recommended to make a backup of the original files.