What did Holly Madison do to make her eyes look smaller? What kind of surgery makes your eyes less bulbous? (Photos)

Not sure what procedure, if any, she has had done. And everyone's eyes are different. Best for you to see an oculoplastic specialist for personal consultation. It may or may not be possible or wise to change the eye shape. See below for one such example.

She looks like botox has dropped her eyebrows somewhat making them look smaller. She's also done heavy dark eye make up and some fillers which have recessed her eyes more.  Should be easily done.At times we do substantial surgery to move the eyes back, but I don't think that's what she's had.

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  The most important aspect is to find a surgeon you are
comfortable with. I recommend that you seek consultation with a qualified
board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

If you are interested in making your eyes protrude less, I would recommend you find an oculoplastic surgeon.  Discuss risks and benefits carefully when deciding whether to proceed with this type of procedure.