I'm lifting weight in order to improve my physical appearance.
But I'm unsure whether I'm doing enough or not enough.
This is a very common scenario in every sphere of human endeavour, which is good for us because that implies it is well-understood. One common approach is the process consisting of the steps that I'll detail below:
Step 1 - Establish baseline. You want to get a measurement of your starting point. For this particular situation, you'll probably want to take some photographs of your physical appearance.
Step 2 - Do something for a while. With the baseline established, you'll then do... something. The important thing is to do the same thing, and to do it long enough -- both of which are often more difficult than they sound for many people in your situation. As a pure stab in the dark I'd suggest sticking with one programme for at least one month; recommendations of two or three months are not uncommon.
Step 3 - Take new measurements. You want to see if what you're doing is getting you what you want. So take more photographs.
Then you'll need to compare the original baseline with where you are now. This is usually difficult for people evaluating their own physical appearance. Asking others to provide a less-biased evaluation may be helpful.
Step 4 - Make changes to what you're doing in Step 2, if you want to make any, and repeat the process.
That's about all there is to it -- but the devil is in the details.