Images in content type: reusing and limit
Use the FileField Sources module to allow you to select new or existing files through additional means, including:


Re-use files by an auto-complete textfield
Attach server-side files uploaded via FTP
Transfer files from a remote server (cURL required)


4. Select existing files through the IMCE file browser

Also, to raise the limit of uploaded images from 10 to more, edit your image field settings and set the "Number of values" to "unlimited"