The appearance of small eyes is created by the surroundings eyelids and brow.
Your aim is to make the eyes appear bigger. Hooded eyes present the same problem.
How to achieve it
Less may be more. Too much extension lashes may only make the eyes seem even smaller. The best answer is to place the emphasis of the extension lashes on the middle of the eye, and also use a strong curl at that point. This should open up the eye.