What could be done to improve my smile? (photos)

I can see from the photos that you are missing a tooth, are perhaps 2 teeth. This is the problem type smile that always occurs when this happens. Either an orthodontist pulled your teeth together this way, and did not discuss the cosmetic result with you, OR, your teeth just came in this way.the reason you do not like your smile is that there is extra space because of the missing teeth, and the front teeth will always drift apart, even after braces. the second thing is that the side teeth, on either side of the 2 front teeth do not have a nice shape to them. I cannot see exactly, but it appears that the cuspids, the pointier shaped teeth are in the wrong position. that leaves you with a narrower, asymmetrical smile. pretty smiles are those that are symmetrical side to side.Good news, these kinds of cases work very well with porcelain veneers. this is exactly what veneers do best..give symmetry to a smile, right on top of the poorly shaped teeth... and just like that, you have properly shaped teeth and a great smile!!
But do seek out a cosmetically trained dentist that explains all, and includes a Wax up of your designed smile. It takes some planning by dentist and veneer lab, so only trust a well trained dentist.Good luck! It will work out very well.

eMax veneers can improve your smile in a degree. Lip lift operation is also a common remedy however the distance between your upper lip and base of nose seems to be short already. Best option is eMax veneers.

braces or smile makeover

you have two options,the best one is to do braces and to bring that bite to a correct position,the situation is that at the end you will have a good oclusion,but you will still have the same teeth,with the same shape,size and color,and it will take up to 1 year aprox.now if you do not want to have braces or having braces is not part of your plans,

you can have a different alternative solution,which is Smilemakeover,where you will be having a full mouth change  in just a couple of days and change your life!,and you will certainly will have also good results with several techniques involved,and you will be changing shape,size and color.