I think it's important that you're actively taking lessons with great mentors and acting coaches. One of the most helpful ways to see how you're performing is to video-record yourself. While it may seem awkward, when you go in for an audition, that's exactly what the casting agents do. For me, it became nerve-racking that my only audience was a small black camera that was capturing what I was doing. I honestly think that is the biggest way to reflect on how your acting is through always recording yourself and seeing what needs to change.