As of now, Uta is indeed alive. The story hasn't depicted anything otherwise. Maybe there'll be changes in the future, but for now, Uta's part in the manga continues with them being alive.
For sharing fanart on deviantart, first, create high - quality art. Then, sign up for an account on deviantart. After that, find the 'Upload' button on the site. Fill in details like the title, description, and relevant tags. Make sure to credit any original sources if your fanart is based on something else.
Yes, it's possible. You could also reach out to individual artists you admire. Check out platforms like DeviantArt or Tumblr. Look for artists whose style might match your story's vibe. Send them a polite message explaining your story and ask if they'd be interested in creating fanart. Just be prepared that they might be busy with their own projects.