Q. I need criticism on Beowulf, especially anything that discusses heroism.

All our literature databases have articles on Beowulf. For your particular topic I would recommend: 

1. Select Literature & Language on the A-Z databases: Literary Criticism page.
2. Type in Beowulf AND hero  (using hero will get both hero and heroism in your results)
3. Once you are viewing the result list, you can limit your results under Subject to literary criticism. 
4. Now you'll just need to review the articles to find the best ones.