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This is an ideal case for ImageMagick.

Given input.png:

![A random image](https://linux.codidact.com/uploads/u2xsoo0o2bqubz94fm776ykov1dt)

Running this command:

```
convert input.png -draw 'fill yellow fill-opacity 0.5 polygon 50,50 100,30 150,50 100,150' output.png
```

Produces output.png:

![The same image with a semitransparent yellow kite drawn on it](https://linux.codidact.com/uploads/dz7vez1kn1hhkgu93ip3ghr2jo1f)

For far more information, see [the documentation](https://imagemagick.org/script/command-line-options.php?#draw).