analysis of a paintingHow do you write a formal painting analysis?

I need to write an analysis about a painting, and I've chosen "Corn, No.2" by Georgia O'Keeffe. However, this is my first time doing an assignment like this and I've no idea what to do! It must be a minumum of 350 words analysis of a paintingand max of 500.. any tips??
Try this:
TWO-PAGE FORMAL ANALYSIS OF AN ORIGINAL WORK OF ART:


Also, How to Write About Art:

You could write about the lines, the colors, the shadows, the shape of the object, what setting itsanalysis of a painting in, what media it was done in. That kinda stuff you discuss in your paper, that what i did when i had a paper due in my art history class because he wanted an analysis of someone's art piece.