Hello HChrocks,
Unfortunately I will be Rejecting this map.
The theme isn't very original, there are already multiple maps based around enderdragons and the end (EnderDragonHead - Hard for example) The build is also quite plain, but I understand it's hard to add a lot of detail to something like an enderdragon.
The parkour isn't very good. There are a lot of single block jumps, and the different types of jumps you used are very grouped together. (By this I mean, there are a lot of single block jumps, followed by all the fence jumps in the map in the same spot, etc.)
The parkour is also mainly floating, which makes the map look unattractive. I would recommend implementing the jumps more into the build, rather than having them floating around the back.
Thanks for submitting your map! I hope to see more maps from you in the future.