Before comparing two sample photos, write down the visible finish and the lighting context for each image. A photo can help recall what was seen, but it cannot by itself establish a material guarantee or a repeatable result.
Keep the observation specific
Use notes such as “lighter surface,” “darker edge,” or “detail less visible in this photo” instead of calling a sample better. Link the image to the artwork revision and the date of observation, then decide what one variable you would examine next. This makes the comparison useful without overstating what an early sample proves.
For related sample-record ideas, browse /updates/ before making the next comparison.