Wow, that is pretty awesome. Excellent job, especially for a first pick.
Although it is difficult to judge the size acurately, ady1989 is right. You would find the pick more useful if the shaft was thinner. Also, round off the squared corner on the bottom where the tip meets the shaft so you can snake upside down without getting hung up.
For the next pick you make I suggest a short hook, or a half diamond. If you are confused about the size I usually go with slightly larger than the tooth of your average house key is about a perfect half diamond. Check out Raimundo's thread if you want some step by step instructions on making a good bogota carry set.
http://www.lockpicking101.com/viewtopic.php?t=8205
It seems like you might find it useful since you were able to file that beauty.
As for the metal rake tines, yes they work just fine. I prefer them over hacksaw blades for making stiffer picks because I don't have to file for 86 hours to make a good shaft. I suspect they aren't the same quality steel, but they have worked well for me.
-Tooly