Paint.Net Image Editor

Use this one of PNG file:

[1]
Transparent means: the transparent background! Not meaning the image itself is transparent

magic wand 魔法棒
Removing background in Paint .NET

[2]
This is ANOTHER good way to use Eraser to remove the background image of your wanted image part:

The important trick is to change the brush width to smaller to erase smaller parts:
Removing background in Paint.NET

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