i use an original gameboy color and its not ideal for recording runs but i dont have any other way to record. if there is good lighting and i have steady hands throughout the run can the stock GBC screen recording be verified or is it just too small?

If your recording looks somewhat like this, it should be OK: https://www.speedrun.com/ladx/run/oy2p569z

It's very hard to record a handheld properly though. Having to care about the camera recording everything in frame is one more unnecessary challenge, taking your mind off the actual speedrun.