Afterthought: Many many moons ago a company called Archive Miniatures had a gorgeous dragon mini called Shredni, the Serpentine Dragon. It became their logo for quite a while. It came in 14 pieces (I kid you not), and the body was indeed long, twisting and serpentine.
I had a couple, and they looked
good! I saw their display at Gencon, and they had one, assembled and primed, though not painted, on display at their booth. It was broken.
Each wing came in two pieces, and the attachment to the body was quite long compared to the wingspan. Even so, short wings and large connecting surface, even the pros who
made the bloody thing couldn't get it to stay together.
So, what does this have to do with the question, other than being another artistic depiction of a Dragon who could never get off the ground?
It exemplifies the problem for a flesh and blood dragon: How to get wing joints that can take that strain, and muscles that can move them with enough force.
I think that the answer is magic, not just for lift, but also for muscle and bone density. They have to exceed anything the natural world has ever produced, by a factor of about 20.
BTW: If you ever face this problem with an assembled metal figurine, I suggest a "pin vise" drill and some jeweler's drill bits. A few well placed holes, some hard steel straight pins running through both pieces, and a bit of glue can work wonders.
Like I said, I had a couple of those dragons, and mine didn't fall apart.