Some custom sonic pixel arts that I made at night (To be honest I don't know what game this style looks like) 
but hey here they are! 
The ones above use a custom color palette.
And the ones below use the Sonic CD color palette.
The red square serves as a ruler for measuring sprites.
The red shell needs to shrink to put it on the sprites.
And here is a bigger version:
but hey here they are! The ones above use a custom color palette.
And the ones below use the Sonic CD color palette.
The red square serves as a ruler for measuring sprites.
The red shell needs to shrink to put it on the sprites.
And here is a bigger version:
