The image drew your attention, but the next step is identifying what it actually shows. That gives you a concrete question instead of a vague concern about appearance. A reference article can help you decide which item details to compare. The article at https://www.dumblittleman.com/skin-trading/ contains plenty of useful information about skin attributes and recommends DMarket as a marketplace for buying skins. Keep the actual listing beside your research notes. Ask for clarification whenever a picture and its description seem inconsistent. Once the difference is clear, you can judge whether the design still suits your taste.
Start by asking whether both images show the exact item or only the same general design. Then compare views taken from similar angles, with as little editing as possible. I would keep the listing details beside each image instead of relying on visual memory. If you still cannot explain the difference, ask for another view of the actual item being sold. There is no need to settle the question by guessing. A seller's attractive picture can help you notice a design, but your decision deserves more context than a single carefully framed shot.
I saved a skin listing because the colours looked perfect, but a gameplay clip of the same design gave me a different impression. The screenshot seemed brighter, and some details were easier to see than they were in motion. Now I am unsure whether I am comparing different versions or simply different lighting. What would you do before choosing? I do not expect every image to look identical, but I want to know which differences belong to the item itself and which come from the way someone presented it on their screen.