Those look pretty good. I've been making friction calls as a business for some time, and assure you that if you got good sound out of your first attempts you did good!
It appears that your glass call doesn't have a soundboard on the inside. Normally friction calls have a 3" slate, wood or glass soundboard underneath the playing surface. Most professional callmakers will tell you that you cannot get good sound without a soundboard....It is possible that you could do ok without one but I bet you'd massively improve your sound with one.
A couple callmaking web forums that might interest you are the THO game call forum and the Custom Callmaking Online (CCO) forum. Also, check out the book by Greg Keats on call making. It has a turkey calls section that has some good info.
Last edited by thekctermite; 02-20-2010 at 10:35 PM.