Classic lashes are where a single false lash is applied to each one of your own lashes, giving length, curl & depth to your own lashes. They are tailored just for you, so this means how long they are and also how curly they are.
Russian lashes are where a fan of 4 or 5 much finer lashes are applied to each one of your own lashes. This gives you extra fullness, length and curl. Russian lashes will look much thicker and fuller, whereas Classic lashes are usually more natural looking.
Touch ups can help eliminate the gaps that begin to make your lashes look a little ragged and less neat. If you go in every two or three weeks to have the gaps filled in, you can maintain your thick-lashed look indefinitely without having to pay for a full eyelash extension procedure each time