Since your job keeps you at home, you probably are not going to get the proper exercise you need. Therefore, you have to be very careful about what you eat. Whatever you do, you don't want to add on any extra pounds.
eh. depends on the model, their metabolism, and their audience, but by all means do what you can to keep your look from changing too much in any case, once you have a set audience you will want to make sure you keep them coming back