Apply a Gaussian blur (Radius: 15-25px) to the background. Ghost clients imply you are "blurring the lines" between legit and cheat.
Photoshop (or GIMP/Photopea), Minecraft skin renderer (Blockbench or Novaskin). Koid Ghost Client Thumbnail
Render your Minecraft character in a double-height combo. Do not use a crit particle. Use a simple sword sweep. The opponent should be knocked back slightly (leaning backwards). Apply a Gaussian blur (Radius: 15-25px) to the background