This resource is intended to help students develop skills to improve their writing in Art and Design.
I like how this site highlights "reading AS research" and "observing FOR research". There's also a lot of useful tips on how to do observation/formal analysis/writing reports/etc. The best part is it encourages the keeping of a visual journal - a cool way to mark observation as a tool for discovery in research in art and design.
Most part are short and sweet or in point form and comes with diagrams and images.
This site is based on a text written for the art history undergraduates of City College of New York. It contains useful tips that focuses on visual description, stylistic/iconographic/historical analysis, etc. There's also step by step guide on writing and research processes. What I like best is the sample student papers where, paragraphs by paragraphs, the author gives detailed comments, recommendations, and revisions.