I recently wrote about his non- movie poster work here. That post included a quotation from illustration maven David Apatoff, who thought Peak's movie work became somewhat stale over time. I tend to agree, though his poster art is often striking and usually very well made.
Below is a sampling of that work in no particular order.
Too elaborate for my taste -- Why were so many minor images needed?
Closer to Peak's regular illustration style.
An example of cookie-cutter cliché poster design.
More interesting, but again many sub-images. At least they are very small.
Later on, Peak began incorporating airbrush.
The upper part of this (possible concept) illustration appeared in posters.
Interesting design incorporating montage elements.