Keeping digital hair color comparisons consistent

[LiamSt]

I am preparing a portrait comparison for an online group discussion about possible hair color changes. I would like useful comments on the shades, with as little distraction from the layout as possible. I am keeping the crop identical so the face does not become larger in one option than another. While looking into a hair color simulator I started making a checklist of the settings that should stay consistent. I plan to keep the original background and avoid making one version brighter just to improve its appearance. I could number the pictures first, allowing people to describe what they notice without a shade name suggesting an answer. I will explain that the images are discussion aids and cannot show exactly how real coloring would turn out. Once everyone has described the pictures, we can reveal the shade labels and compare the wording people used. Are there any obvious controls missing from this plan for presenting hair color alternatives?