So I got this commission (and other, related ones) on May 16th, 2017, and I have held off on uploading them since I have forgotten who I commissioned for these images. If you are the artist, please let me know, I would be glad to work with you again.
This is the artist on Twitter, though they have not posted it themselves.
For ease of viewing, I added a white background behind the drawing, as, in the original form it was black and transparency.  
And yes, I got permission from sketchy mouse to commission this character.
 
Alternate drawings:  
Chibi mouth open: >>2390838  
Chibi mouth closed: >>2390827  
Adult mouth open: This one  
Adult mouth closed: >>2390830
 
My colorings of my commissions:  
Chibi mouth open: Haven’t finished  
Chibi mouth closed: Haven’t finished  
Adult mouth open: >>2390841  
Adult mouth closed: >>2390842