You might want to create a thread documenting your photos rather than creating a thread for each individual photo. The NM 118/US 66 thread is a good one to repurpose; just rename the title of that OP to "HighWaySignLover013's photos", and you can use that thread for your future postings. Once this is done, a moderator or admin will likely merge this thread with that one. (Don't do it the other way around; when the threads are merged, the title will be determined by the post that was made earlier.)
It's also useful to embed the image onto the forum rather than requiring users to click the link. I don't know whether this is possible on DeviantArt or not, but if it is, you'll probably get more views on this forum by not requiring people to click a link.