To make the eyes appear larger, keep the color on the eyelid itself light but put a darker shade on the crease of the eyelid. Then, highlight under the brow. Next, dab a shimmery, light, loose eye shadow on the inside of lids (in between the bridge of your nose and your eyes). Don't apply eye liner to the inner rims of the eye, keep it to the top and below the lash lineor. To finish it off sweep on some lengthening mascara.
Like melonberry I'd say don't put eyeliner on the inner rims of your eyes, but put it on the outside and this really makes your eyes look bigger (stick to the middle and work out) Also work the lashes and use a curler before applying mascara.