I may be able to help! I think I've become quite skilled at having a professional looking facecam. Let me give you a little run down, but first a comment.
At the end of the day, it's not how good your equipment is or how high quality the video is, it's all you. Being entertaining and engaging is going to build a larger audience compared to upgrading your equipment.
I'm sure most people already know that, but y'know, just throwing some words of wisdom out there.
Anyways, on to the tips!
- Center your face - make sure you are in the center of the frame most of the time. No rule of thirds here.
- Show yourself, not your wall - so once you've centered yourself, you can always crop out what you don't need. When it comes to gaming, I believe most people want to see the person, not their neat posters. (But do keep a nice consistent background too)
- Let there be light! - Make sure your face is well illuminated. You don't need one of those soft light box kits to have good lighting! Try having a lamp or something directly on your face, and if you need to, put a white bed sheet or pillowcase over it to dampen the light. (Make sure you don't light anything on fire though)
- Angles! - make sure you have a good angle, many people prefer to have the camera at eye level and off to the side a bit (beside your monitor)
I think that's pretty much it. Other then that just be engaging and entertaining and you'll be good! (Easier said then done though, haha. Still working on that myself)