Options for Enlargement of Asian Eyes

The double eyelid procedure will help to make your eyes look bigger. Based on the picture, it doesn't look like you have any crease. Sometimes skin is allowed to override your eyelid margin which can make the eye opening look smaller.  Also by creating an eyelid crease, the shadowing contributes to the appearance that your eyes are bigger by creating the shadow the meets up with the dark part of your eyes. 
Another procedure that can help open up your eyes is the medial epicanthoplasty that is done in the middle part of the eyes that will open the eyes up horizontally.  Lastly, you can do a procedure that tightens up the muscle that opens up your eyes but this is advanced, is not standardized or universally accepted to open up your eyes.
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Thank you for the question.  You’re absolutely right regarding whether a double eyelid surgery will make the eyes look bigger.  Creating a double eyelid will help accentuate the eyes and help define the periocular region.  However, the overall size of the eyes are dependent on the vertical and horizontal dimensions when eyes are fully opened.  Sometimes the vertical dimension is dependent on the upper eyelid opening mechanism.  In some patients ,and it’s especially more prevalent in Asians, the muscles that help open the eyes are weak.  This is referred to as ptosis or “lazy eyes”.  In order the make the eyes open more there are different techniques that help tighten the muscle so that the vertical opening of the eyes are enlarged.  
The horizontal width can be enlarged by either opening the inner or outer corner of the eyes.  This is referred to as medial epicanthoplasty or lateral canthoplasty.  
Commonly depending on patient’s condition and wishes, we perform these ancillary procedures in combination with double eyelid surgeries to complete correction.  Please make sure to address these options with your plastic surgeon with experience since double eyelid surgery on its own does not “enlarge” the eyes.

You would likely benefit from Asian eyelid blepharoplasty which will automatically make your eyes look a bit "larger."  You may also benefit from a medial epicanthoplasty and a levator advancement, but I would recommend seeing a plastic surgeon with Asian eyelid expertise who can evaluate your eyes in more detail.   Good luck!