Focus is good. Brief articles are usually more effective when they focus tightly on a topic. C.E. Illustrations are good. Written instructions are easier to follow when accompanied by pictures. If you can't draw, see if you can talk an artist friend into helping you out.
Documentation is good.
Demonstrate the relationship between your work and a medieval subject or activity. If you submit a poem, include two or three paragraphs on how the form or subject matter conforms to a period model. Passion is good. Draw or write about something you love. It will come through in the final product.