Glad this was helpful, ladies.
Elisabeth, I also have thick, dense and long lashes, and the spaces between my lashes is small. Una's step #2 looks about right - (but the model isn't wearing mascara!). The eyeliner goes UNDER the lashes and appears like a line between the lashes. The strategy is very effective. Perhaps you can see in the pic below.
Ladies, if you're still unsure, go to the Laura Mercier counter and let them apply the liner and mascara for you. You MUST wear mascara though. The line looks off if you apply it without.
Lisa, I LOVE blue liner and mascara, although my eyes are olive.
Merwoman, I wear specs daily and there is no smearing. Train hubs.