Since neither app (Tweed or Spaz) supports uploading pics as of now, you can tweet pics from email twitpic or flickr
Make Twitter a contact in your phone (# is 40404 if in US), and make its email the one you find at: Twitpic - Share photos on Twitter
Then when you email the pic to twitter, the subject line will be the text of your tweet
Go to http://www.flickr.com/account/blogs/add and pick "Twitter" from the dropdown and give your twitter user/pass and authorize flickr
Then look at http://www.flickr.com/account/?tab=email and use the email from "Your Flickr2Twitter upload email" as Twitter's email. Subject line becomes the tweet. 112 char limit.
hope this helps some