Feedback questions are typically closed (examples 1, 2), but they are not concretely off topic. See this dusty old post for pointers on how to ask a good critique question: Asking community to critique work?
If it's just feedback on color combinations, I'm not sure there's enough substance there to keep it from getting closed. However, there have been a few questions that I've seen that are similar to what you may be aiming for:
If you can phrase the question in such a way that it will be beneficial to other users and not just yourself, then I say go for it.
If you think it will help, feel free to update your post with the front and reverse sides. As long as it's not something like CLICK HERE FOR NEAR-REAL ROLEX WATCHES then I don't see it as an issue.