How can I improve my porcelain veneers on my lateral incisors?

I have porcelain veneers on my lateral incisors and I don't like how they look. I feel they are too long and too large giving me an unnatural smile. I feel my central incisors lose their focus as they are dominated by the laterals. Is this is a correct assessment? I feel there is a large difference between my trial smile (more natural) and end result. What feedback can I provide my next dentist to improve the end result?