Based on your picture, you do not appear to have a significant amount of subcutaneous fat.
Abdominal etching should only be done with great caution by people who are experienced in the technique and with great patient selection.
It is a procedure that has the potential of causing significant deformities.
Sometimes the enemy of good is better.
Make sure you're in the hands of someone very talented in this type of work if you decide to move forward.
Best of luck,
Mats Hagstrom, M.D.