At some point, you need to assess your own work and decide whether it is good or not. There are certain ways through which you can evaluate your performance and per day outcome.

Attitude is an important aspect. Apart from doing your job in time, leaving office, spending time talking to your friends instead of working can have a negative impact on your work.

Keep the copies of your work in order to assess your own performance.

Try to get feedback from others about your work. It will help you judge yourself and improve, if required.