As a creator/member I know I appreciate and enjoy adding pics directly to Mod The Sims forum posts and downloads rather than using a hyperlink option .
This facility is not available with Private Messaging though and I hope you would consider adding it here too?
I think this would help creators show a requested object to a member (and get feedback) prior to uploading.

Ladysimplayer8

You can use an external service and just use the [ img ] tag to add the images.  Due to the way the backend works, it's not possible to add them to PMs.