Thank you for the offer, but honestly, not really.
First off, the use of Comic Sans is rather unflattering, the font has an image of being... well, quite the most awful font ever. And I didn't make that up, e.g. here's a nice parody of that: [link] Also it seems you used a mouse for drawing the outlines which may be why the outlines look a bit shaky. This might as well be a choice of style, but most of the time it isn't. Next thing is that the two lower panels don't make a consistent line with the upper one but neither are so much wider that it looks like being chosen on purpose.
Keep drawing though, you'll get better at everything and for now it already looks nice. Just not astonishing enough so that someone would probably buy a print of it, they cost quite something after all... When people are interested in your prints, they'll buy them, you'll know then anyway.
I'm not sure who you are targeting these towards and I don't really see them very marketable. But I can give you a tip along the way.
Stop using the circle tool for faces. You seem to like Sonic so let's use them as an example. Sonic characters faces have volume and dimension, the sphere is only one shape among several used to construct it. [link] This page has some examples from Preston Blairs excellent book Cartoon Animation that demonstrates this idea.
There are a lot of things to improve upon but I think you can start here and discover more of the fundamentals as you move along.
---Here are the links---
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