The ability for Photo Owners to delete their images may be on the horizon. I may be needing this feature myself for my upcoming PhotoSmash sharing hub http://pixoox.com

Unfortunately, deleting isn't possible right now.

In order to give a single person access to upload (in addition to true Administrators), you can set up a role for a gallery and give that only to the person you want to have it...Set the Minimum Role to upload to Admins, then only that person and Admins can upload to it. You could use Justin Tadlock's Members plugin to create the role (or maybe it's a capability) and assign it to the person, or the Role Manager plugin (which I think is outdated, but still works). Here's the instruction I wrote on the original PhotoSmash release site back at: http://www.whypad.com/posts/photosmash-galleries-wordpress-plugin-released/507/

Do a search on part of the text from below if you want to go over there and read it...it's formatted better there....Hope that helps:

BEGIN CUT/PASTED INSTRUCTION (it ain't pretty...sorry)

To use with Role Manager plugin: the Role Manager plugin lets you give specific subscribers additional capabilities. PhotoSmash supports these capabilities by allowing you to give users additional access to galleries that their roles do not allow (e.g. a Subscriber could upload to a gallery that is set to Admins only). Here are the steps:
Install the Role Manager Plugin (see link above)
In the Users menu box in Admin, click on Capabilities
Add a capability called: Upload to PhotoSmash
To assign this capability to a user, click Authors & Users
Edit the user you are targeting
At bottom of user profile screen, check the Upload to PhotoSmash checkbox in the Assign extra capabilities section and Save (Update) user…this user can now upload to any gallery regardless of the minimum role you have specified for those galleries.
To target a specific gallery, in #3, create the capability: Photosmash ? (where ? is the gallery ID #, e.g. Photosmash 10 ). You can find the gallery ID # in the Gallery Settings screen in PhotoSmash admin section. It is the same number that is used in the shortcode that can be used to specify a gallery. Choose this capability in #6 instead of the Upload to Photosmash capability. Assigning both would be redundant since Upload to Photosmash gives access to all galleries. You can assign as many specific galleries to a user as you like.
To add the URL field to the upload form and use the user submitted URLs as the link for your captions, there are 2 settings needed to use feature: 1) you must turn on the field to show up in the Upload Form. Do this in PhotoSmash Settings / Gallery Defaults tab, the checkbox at the bottom of form. 2) There are 2 options in Gallery Settings and PhotoSmash Settings pages under the Viewing tab and in the Image caption style that will use the User submitted URL as the caption link…look at option #3 and the last one.