This is the Thwomp and Thwimp extracted from My SMW Hack.
The palette is similar, so you don't need to change it.
Thwomp/Thwimp copyrights are Deviantart.
These graphics were custom made by TrinitroMan from MFGG, but you only mentioned yourself in the Authors field. If you resubmit this, make sure you include both the original author and you, the ripper, in that field, as it's inconsiderate to disregard the original author for custom made graphics.
Also, you submitted one of your screenshots in .gif format for no reason. With the exception of animations, always use .png format for your screenshots.