Is my art good enough to get commissions? I did these for free for people to get a portfolio going

I'll be the one to give honest feedback, no, this art is not up to the level of commission work. Practice shading, sketching figures, and composition. Take some painting classes and watch videos on composition and shading. Like most crafts, it will take a great deal of hard work and practice to advance your skills to the level where others will pay you for them.

First sketch the anatomy of the figure, then add details, then add color, shading and highlights. If you start with just coloring it in you will end up with unrealistic figures and proportions, as you have here, which will never transition to the higher quality portraits you are thinking of selling because you're not starting with good fundamentals. Bolster your passion for art with a foundation in the true skills so that when you practice, you're improving in the right way.

They have potential. It's just "flat". Which they could lean into once they understand why it's flat. The ideas are all there for something better. The backgrounds are interesting. But idk if theyre cg or not.
But to add to this, sometimes style is more important and I know of more than a few artists that are very far from realistic anatomy, shading, or proportions. Sure enough, this still requires a lot of work (maybe even more, since the style must become refined and appealing to people), and some more general pieces of advice still apply, like taking composition courses
- sometimes style is more important
  
  I don't know about that.
  
  The art lacks basic foundational understanding of anatomy. You have to understand the rules before you break them.
  
  Rob liefeld got lucky during an era when we wanted something so wildly different. He's one of the rare times when style got him paid. But if you don't have the technical background, once the style becomes imitated, the lack of skill shows, just like much of Rob's work.

Were the people who asked you happy with the result? The question is less is your art good enough - the question is will people pay for it, and how much. Best way to find out is to start trying! You can do it!

Don't worry if it's good enough. It'll never be good enough for you. If people want it then that's all you need to know.

All art is good enough for a money laundering scheme.

There's no bad product, only a bad price. Right now that price may not be very high, but if people want your work and they know what to expect, there's no need to turn them down.

Did somebody say Thunderfury, Blessed Blade of the Windseeker?

Pretty sure I specifically heard someone say [Thunderfury, Blessed Blade of the Windseeker].