Perfecting HDR photography is still perfecting photography in that I think you never really get it right, you just get better at it . Oh yes you can get better at it but if you are your own harsh critic you will always find ways to make improvements. Ways to tweak things so you can see progress from the early beginnings. It’s a fun journey but some times a long and slow one. When it works it can really work. That’s the reward I suppose.