I just went from Veneers to Crowns on my front 4 teeth. They don't seem natural looking. Should I have them redone? (photo)

this the depends on how much tooth surface it was removed, and also the material on which the new restorations where made, there are several really cosmetic materials that can be used on cases like yours to get to a more cosmetically solution. metal free materials are the best for this anterior cases.

I don't know your whole history, but I assume there was a good reason to go from veneers to more aggressive tooth preparation - crowns.  Natural looking all porcelain restorations are very possible and are preferred by most patients I encounter.  After 20 years of practice and a strong background in cosmetics, i have found there are only a small minority of dentists and labs that can produce these results.  The greatest challenge is the lab.  I would refer you to Jason Kim Dental Lab in New York City.  His prices for lab work are 5 times more than what most dentists are paying for lab work, but you get what you pay for.  If you have a competent dentist work with Jason Kim, you should get excellent results.