Hi there! :)
First, let me start out by saying that I'm glad you've put forth the effort to transition to the digital medium. I always make it a point to wish my best to artists who are converting from pen and paper to computer and tablet; it's a process I too had to learn and not one I was fortunate enough to begin my artistic career with like others. So giving artists like yourself just that little bit of encouragement is something I make a special point to do.
I think your Mega-Meganium is very nice. The idea is pretty funny, to be honest! With all the new Megas being revealed every day and the introduction of Mega Man to Smash. I don't know if you did that on purpose, but it's very clever! One thing you're going to have to relearn now that you're transitioning into the digital medium is how to draw in the lines. It's hard not to rely on those skills you built up and the muscle memory from holding a pencil, but all of that needs to be replaced with a new-found deftness for the stylus. Make sure you move carefully and lightly. Gently sweep your pen, and don't press on it. Right now, your lines come out somewhat janky and your colors are bleeding outside the outline because you're being a little heavy handed. Just slow down, be mindful, and before you know it, it will feel like second nature. :)
Best of luck to you! And please don't hesitate to reach out and ask any questions you may have!