Tool: Romi's SpriteTool v1.41 (though it should be compatible with PIXI for SMWC submission)
Origin Game: SMB1 (after more than 100 secs), SMB2J (Natively at World 7 and 8)
Description - Hammer Bros from SMB1 and SMB2J that run straight toward the player and jump when theres a solid block in its path. Extra Bit set should be running regardless of changed direction based on player's position (basically chasing you down) whereas default (extra bit not set) should only be running based on when it comes into the player on-screen and not run (acts like a regular Hammer Bro.) when it changes direction on player's position. Typically they move left since Mario's levels generally are designed for Mario to go rightward to the goal.
See Here: https://youtu.be/aUBW25PMM5Y?t=29
GFX - use this: https://www.smwcentral.net/?p=section&a=details&id=879, though PIXI and Romi's sprite tool does have an SMB3 brother graphic as it comes with the tools. (SP3)
On Pixel Art Requests: I generally do not accept work unless I either have the time, if I see your project worth my time to contribute towards, and that is usually me doing the approaching to you on that.
-I also do not accept speculative work as I do have various art I made on-hand with me.
-I am more receptive to equivalent exchange of resources in which case, you can DM me wherever I have an active presence on for the details.
-Other times I'm availible for your project is C3 request threads I may run.