Applying eyeliner can be tricky at the best of times but there are some tried and tested techniques that if followed, should give you fabulous results.
For a fine and natural look, apply a thin line of eyeliner to the lower lid. Then blend in with a brush if needed.
For the fuller, round looking eye, first apply to the upper lid, making a thicker line in the middle of the lid using a pencil or liquid eyeliner. Now blend in with a brush if needed to give a smoother line.
For larger looking eyes, line only the outer half of the upper and lower eyelid. If you are going for the dramatic look, apply a thick line of eyeliner to upper and lower eyelid, blending in with a brush if needed.
For narrow eyes, only use eyeliner on upper lid to avoid closing eyes further. For the outer part of the eyelid, use pale colours to give shape and definition. Artificial lashes beneficial to help open eyes and make lashes appear thicker.
For heavy eyelids, use pale colours only on the eye socket. Apply artificial lashes to the corners to lift the eyes and help to make them appear more open and wide.
If you have close set eyes, for the inner lid, pale colours...