I use different decks and methods of cartomancy in my readings. Depending on the deck, the specifics of the nuances of the method may vary to draw from the tradition or current from which the deck derives. At it's heart, however, all methods are about taking the image, and drawing out a narrative from the elements provided.
Deck pictured: The French Cartomancy Deck by Lo Scarabeo
When reading with “modern” tarot cards, those with illustrated minors, I primarily use a position-meaning style of reading in which the meaning of each card in a layout is interpreted writhen the context of the question, and the position in which it lands on the table.
This is the only method with which I will do "general" readings (ones without a clear question or context).
For “Marseille-style” decks, characterized in this context by unillustrated pip cards, I make use of a tirage-en-ligne technique in which a number of cards are put out in a line and read according to the progression and patterns of images, suits and numbers, in the context of the question asked.
For “Lenormand” readings, I use a “Lenormand” card deck, and read an arrangement of cards, interpreting the progression and relationship of the images. I will sometimes make use of the Grand Tableau layout in which the entire deck of 36 cards is laid on the table so that a picture of the main players in the question at hand can be examined.