Why Do Some Digital Models Look Better Than Others?

I try to keep things consistent, however the biggest reason for this is simply my own skills improving over time and with experience. My newest models will tend to be better than my oldest both in a technical sense and a detail one. That doesn't mean I wasn't proud of what I achieved at the time, but I have come a long way during the few hundred models I have created and I'm still discovering new techniques regularly! The second reason is source reference, if what I'm looking it is from an old game then the final model is going to reflect that time period, I'm not completely re-imagining these models, my goal is to capture them how they were and how we remember them! While I would love to go back and remake some models which aren't up to my current standard, as of now they don't generate enough (or in many cases any) sales to justify doing that when I could make something new instead, for this reason some of them may simply be removed over time rather than updated.