I have thicker skin above blepharoplasty incision line, is this normal?

This is completely normal for two reasons.  The first being that there is temporary poor lymphatic drainage above the incision line.  This will improve over months.  The second is that thicker skin of the upper portion of the upper lid is brought next to the thinner skin of the lower portion when the excised skin (transition) is removed.  This will not change with time.  Overall things will improve but not totally correct.

Hello goldengal, 
Thank you for your question. You are correct.  The eyelid skin is the thinnest skin of the human body.  As you go higher and approach the eyebrow, the skin gets thicker (almost abruptly).  During upper eyelid blepharoplasty, the incision (and thus the scar) may be placed between where the thin skin and the thick skin transition.  As such, when the excess eyelid skin is removed, you may see thinner skin below the scar and thicker skin above the scar.  As the incision heals, the "ridges" will smoothen out - in some people it may take several months until it is fully "invisible."  Luckily, when the eyelids are open, the scar is barely noticeable.  
Congratulations on a beautiful result!