For me personally, it's a real struggle of the perfect as the enemy of the good. The work you are doing is great, and the only critic you have to satisfy is yourself. There is no "perfect" model, because even the real things had imperfections. In the end, the whole purpose of modeling is to enjoy the process as much, if not more, than the end product. If you can look at what you are doing and say that you are having fun, then that is all that is important. When it stops being fun, it becomes work, except you aren't getting paid. That is certainly not a worthy pursuit. So enjoy what you are doing.