Hey, another software developer! Welcome!
I'm also a developer but I have the sentiment as you have as although I'm interested in digitals art, I decide to work in technology area due to high prospect area (still have the same amount of passion though). I decided to keep art as an hobby but not sure if I can continue it as a hobby...
This is a random question but is there any software methodologies/process that you look to apply in your art journey? Just interested to know from another developer perspective into art improvement.
Good luck with your webtoon!
NOTE: I love the manipulated image you done for image combination exercise. I think you need a slightly more mist effect on the dragon but the colours and lighting matches a lot!