have you made a storyboard for what you want to animate so that you have your camera angles worked out?
Then you can consider how much detail to model:
Forground, and close ups - lots of details
medium shots and middle ground balanced detail
wide angle and long distance shots, with back ground less detail
I'm not a games developer but when developers for games environments creat models i believe they recreate three of everything, for close, medium and far away scenes and shots, to give the games engine less stress on rendering times.
it's more to do with save time and planning your project in such a way that you could hand it to someone else to complete without any hesitation. which means in the future you can come back to a project and refamiliarise yourself with it and improve it.
better to have a short pencil than a long memory
but great work so far, keep it up
