Are my four upper temporary veneers too big? (Photo)

I don't believe your temporaries look too big.  The probablycould be shaped a little differently to give them a slightlyslender appearance.  I also believe your gumline could have beenraised on the two lateral teeth.  They appear a bit boxy and byraising the gumline it could have given them a more tapered naturallook.  I have concerns about the darkness showing through your temporary.That could be a leaky temporary or you could have a very dark tooth.The temporary gives the dentist an indication of how much tooth should bere-shaped before the impression.  In your case I would probably remove some more tooth in order to prevent show thru.

Thanks for posting the pictures. I  don't feel that your upper veneers are  too large or bulky based on these photos. I do have concerns about the tooth that appears grey. If your natural teeth were small it may take you a period of time to adapt to the larger restorations. Share your concerns with the dentist who did the treatment. They will want to make sure that you have the outcome you desire.

yes, its look little bigger in size. i always say , and this is common issue, after treatment u feel its bigger in size. remember one thing. in case of spacing, veneers is not option to close the space, and u avail veneers for space closure, and such issues arise. in case of microdontia  , start treatment with braces , bring teeth in proper position for veneers, and thn go for veneer treatment.