I Have Double Eyelids but Want to Get Bigger Eyes--what Kind of Surgery Do You Recommend?

I would suggest correcting what appears to be mild ptosis so that your eyes open up more widely. The folds themselves are fine. Making the eyelids open more widely will make you look more alert and enhance the appearance of your eyes further.

  First off, it appears that you have beautiful appearing eyes and do not need anything done at all.  But it may be hard to tell from the single photo that you sent.  There may be a small bilateral ptosis present, in which case you could consider CONSERVATIVE bilateral ptosis repair.

You already have very nice looking eyes and surgery always has risks. You will always find a doctor willing to put YOU through the risk of surgery. The balance of benefit (a slightly more open eye) to risk (asymmetry, eyelid height  too high, too low, scarring, infection, etc) is not that great. If you were my relative I would advise you to avoid surgery. If you were to have ptosis surgery, probably a posterior approach (Putterman conjunctivomullerectomy) would have the lowest risk and most chance for success.