Two lights are better, but if you use thee pendants, then position the two stools should be in the middle of the center and end lights.Although they will look very huge. Pictures would help.

More pictures

Having been brought up in a Lockwood home I can appreciate your love of the wood. I notice you have a light green bench and that would blend nicely with some similar colours in the room. I would consider having your cupboard doors replaced or sprayed to compliment the bench or visa versa you can have your bench updated with a new finish to modernise it. Perhaps you could just price out the cost of a new bench and leave the rest of the kitchen as it is. The odd bit around the dishwasher looks weird and that might be able to be fixed by curving a new bench into a small breakfast bar type set up. If there is room I would also reposition the microwave to the right of the cook top and use the existing space for a display or a lovely pot plant.

Not keen on tiles ... prefer a smooth surface with no grout lines to try and keep clean