Ok, I would not. And I suspect, even if you get better, and find a market for them , you will be looking in the $5 range for what people will pay. That may not even cover your supplies, depending on the cost of the buttons, and even if it does, it leaves you making pennies for your time.
The people who successfully sell plushies tend to sell much more complex, custom made plushies more like this
And even then they are often in my opinion, underpriced. If you are making the same money selling plushies that you would make babysitting the neighbors kids, then why not babysit the neighbors kids and make the art that you want?
Custom plushies of people's OC's have a market, and there are even a few of those who will pay premium, but many of them still want to pay the same price you pay for a made-in-china one at the corner store, which still is pennies for your time.