If your photo is not showing up in your Gmail signature, you'll want to check two places:
1. Your email signature settings on about.me.
Open your email signature settings and make sure the "Show Photo" box is checked.
2. Your signature settings in Gmail.
Log in to your Gmail account and click "Compose" as if to write a new message.
Click on the little drop-down arrow at the bottom right of your new email box.
Make sure "Plain text mode" is not checked. If it is, click on "Plain text mode" to uncheck the option.
Close out of the email and refresh your page. You should now see your picture in your email signature when you compose an email.
If you're still having trouble, please let us know!