After some gathering with friends who good at music, I know there is a ocean of knowledge behide a simple Guitar Pick.
Difference sound was produced if you use Pick of different kind of thickness. And each shape have its own special usage.
I start to think, why not using 3d printer to make one?
That is how I started this.
Update: Uploaded a new file Shark_V3.STL This is a scale down version after some feed back from my friends
This Pick have thickness of exactly 1mm. It may be too thick to produce soft sound. Please scale the Z-axis to adjust a suitable thickness before printing.
Some testing with my friend found that using 0.7mm is good for PLA.
Did not have chance to do any check with ABS yet.