He wrote in short sentences and short chapters, often in the first person (the "I" form)...
HAHA, this is spot on, but hardly original! Of course, Buk does express himself in a rather idiosyncratic manner. In a real sense, if we all wrote, we would all write in an idiosyncratic way....but most of us would be SHITE...because we don't have the patience or intiative to keep carving at the word, our word.
Remember to add in your essay that Bukowski payed close attention to - formal poetic structure, such as a sonnet, haiku, sestina, ode, blues poem, etc. Also mention that he focused greatly on Rhythm and often his poems have an identifiable rythm arranged in meter such as iambs, spondees, trochees, dactyls, etc.
Bukowski was a stickler for Formalities of All Kinds
and loathed those Free Verse degenerates!
In fact, use that as a quote in your essay,
embolden it: your Teacher will love it.