Hi, my team and I are developing a browser-based 2D game and we still need big-headed animals and mobs with very simple character sheets (only looking front with basic animations). I saw your style and it would fit perfectly. We also pay promptly and appreciate long-term co-operations where possible so you could easily make a few hundred bucks or more and get your name as an artist out there because we will make sure to give proper credit. We also pay bonuses for extra work (for example caused by getting together and working out a style in the beginning)
Here is an example of one of our avatars (commissioned from the talented novclow) for style reference (you'll notice it is similar in style to what you did in your examples):
You would not have to make them this big though but about half that size would be good. And you can freely show what you make on your art websites, just would have to make sure to point out they are copyrighted.
Please get in contact with me if you are interested and you should find us very good to work with :)