It is very difficult to say if you can have smaller veneers without looking the mouth.

When carrying out veneers the following are done

1. wax up of the potential veneers on models
2. once approval has been reached then the teeth are prepared and temporaries are placed. These are adjusted until the patients is happy.
3. these are copied for the final veneers, and tried in before they are cemented. we require the patients approval before we can cement them in.

Also at our practice the patient has a consultation with the technician , who produces the veneers to get as much info about shape, colour. etc.

I would recommend a consultation with a cosmetic dentist to discuss your options.

Regards