You can not include links to pics – you will have to embed the Base64-encoded-version of your pic in the /etc/mumble-server.ini

1. open a picture in GIMP e.g.

Gandghi - Es gibt keinen Weg zum Frieden - der Friede ist der Weg

2. shrink it down to like 100-300px in width.

3. ramp up brightness and contrast (to reduce amount of nuances -> smaller picture size)

4. export it as *.GIF or *.PNG and check file size – should be below 10KByte

Gandghi - Es gibt keinen Weg zum Frieden - der Friede ist der Weg_smal

5. Base 64 encode your picture

cat picture.gif | base64

vim /etc/mumble-server.ini

# modify welcome message

welcometext="<br /><img src='data:image/jpg;base64,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'/>Welcome to this server running <b>Murmur</b>.<br />Enjoy your stay!<br />"

hewe go: mumble server welcome message picture

admin