If you need help getting signatures from fellow kernel developers, you can look on the keysigning map to see who is available nearby to sign your key:
Each placemark should have the person's email address you can use to contact them, and their PGP key information.
If you are already have a kernel.org account, we encourage you to add your information to the map, so other developers can get into the kernel.org web of trust. Here's how you should do it:
git clone firstname.lastname@example.org:pub/scm/docs/kernel/ksmap
developers.kmland sync it to the website. You may need to Ctrl-Reload to see your changes.
The picture you see on the placemark is provided by libravatar based on the email you list in the yaml file. If you want to change it or add your own, go to https://libravatar.org.
Please be mindful of your privacy when putting in your coordinates.