Hey, nice to see new faces to pickmakeing.
First I'd suggest to compare it to the pictures others have posted or to commercial picks. A key works well too. Just make sure the neck of the pick is at least as long as the key(from tip to sholder). If you made a hook it should reach into the valleys of the key. A pick which would reach for the teeth will be too large to fit into the keyway properly.
Then you should finish it nicely. There are several tutorials on finishing picks, a good was posted by kspec.
Enjoy your pick and keep practising.