Repetition gives you a way to compare photographs without needing background information about their maker. In a portfolio credited to Ken Hornbrook, identify a shape, tonal relationship or arrangement that appears more than once. Look for changes in scale, position or surrounding detail. A repeated motif can create continuity, but the differences between its appearances often carry the more interesting information.
Keep the comparison small: two or three frames are enough for a useful observation. Explain how one changes your understanding of another, and check whether their displayed order matters. Do not label a recurring feature as a signature based on a narrow selection. Treat it as a visible pattern within the particular group you have examined and leave room for other work to differ.