You certainly could put two veneers on the front teeth alone but I think you might be disappointed with end result.
some of the problems facing the dentists, when treating the two front teeth alone, is tooth size, alignment, shape and colour. All of these factor into your final result.
Its important to remember that in any smile, the two front teeth are the KEY to the entire end result of veneer treatment.
SIze - if you only allow treatment on the two front teeth the dentist has to fit two teeth into the space between the teeth on either side of the two front ones. This means that the width of the two front teeth will be determined by that available space and not by the principals of smile design. The dentists will be forced to have the Veneers made to fit that space and will lose control of the artistic design that is necessary to provide optimum tooth shape. You could end up with two front teeth that look too big, too short, or too wide.
Alignment - working on only the two front teeth means that the dentist will have to align those teeth with the surrounding teeth. If your other teeth are out of alignment, flare out, or tilted in, then positioning the front two teeth to align with the other teeth could compromise the look of your smile in the final result.
Shape - Like Alignment, you dentists will have to match the shape of the two front teeth to match the teeth on either side. this can possibly create aesthetic issues in the final result also.
Colour - if you work on the two front teeth only you will have one choice for tooth colour and that will be to match your existing teeth. If you are very happy with the existing colour and don't have a desire to bleach your teeth in the future then this is not as big an issue.
To get a really good idea of what would work best for you a few more pictures would be required, along with diagnostic models and x-rays.
From the picture you provided it looks like your teeth are angled inwards and there are some tilts towards the centre, although it is hard to say for sure with that photo.
In the end it depends on what your end goal is.
If your end goal is to improve the look of the front two teeth only then two veneers might get you where you want but understanding your options is important. It would be good to discuss your case with an experienced cosmetic dentist. Discuss orthodontic options along with smile design options and get all the information before you make your final decision. Everyones needs and wants are different and what you want, although it might not be the optimum smile design treatment, might be perfect for you. Understand what a full smile design can do for you verses two teeth alone and then make your decision.