I like them, I like the happy colorful style. And I think they will sell. But I agree with the posters above. If you submit them one a time they may be 'Overly Simple'.
It has been 6 yrs since I submitted my first 10, so I don't know what the standards are these days. But if you want to be on the safer side, maybe you should draw more and submit them in as sets of icons, in groups of at least four-per-image.