Would veneers work for me with large gap, and if not, what other options do I have? (photo)

In your case I would recommend orthodontics over porcelain veneers due to how large that space is.  If you veneers I feel like they would look way too wide.    

Porcelain veneers would close the gap but your teeth would end up looking too wide which would look very odd. Usually the best way forward would be to have braces to close the gap.
Sometimes veneers can be done but would often need your 6 front teeth doing and make all of them slightly wider so the 2 middle ones don't end up too wide.

Veneers would work, but your teeth will look very big and wide. I'd recommend braces or Invisalign to close the spaces as much as possible before considering veneers. 

Make sure you find a dentist who knows how to prepare the teeth.  Most of the preparation will be on the distal or back side of the front six.

You can make a big change with a combined proceedures,first braces could be a good option,but in case you do not want to do braces,you can go straight to Smilemakeover,shape size and even color to make that big difference,close those gaps.