New Veneers (front four teeth) are causing me speech problems. Is it because of the thickness? (Photo)

Based on your photo, your veneers appear to be fine.  Without being able to examine you in my office, I cannot say that your veneers are too thick/bulky.  I suspect that they are slightly thicker than your natural teeth, and because of this, you are having the speech issues.  My best recommendation is that you give yourself about 3 months to adjust to the veneers.  If at the end of this time period, you are still feeling that they are too bulky, then have them adjusted again or redone.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMD

There is always an adjustment period after new porcelain veneers have been placed.  This can include a slight lisp when you speak.  It typically goes away in a couple of weeks.  If not,  it is usually caused from the teeth being slightly longer than the originals or the thickness of them on the tongue side.  They can be slightly shortened more and thinned out on the inside and this should help immediately.  Thanks for the photo.  They look very nice.  Good luck.  

Yes it does sound that veneers are too long and too bulky. You could have them adjusted if possible else you will need new ones. Normally we would try temporary veneers for the best aesthetic and function (speech, smile, eating etc.) and then copy them into final.