What would you suggest I could do to improve my smile?

You are definitely a case that would need to be evaluated in person, with better photography. In the 3 photos you posted, you have 3 different smiles. So an in person consultation would allow the dentist to see what you look like speaking, smiling, laughing, etc. But just based on your photos, yes, you are right that you have a deep buccal corridor (the dark spaces on the side of your smile). By using porcelain veneers, we can widen your smile and reduce the size of the dark spaces/buccal corridor so that your lip raises higher and you display more teeth. 
Hope this helps!

you can have great results with a full mouth makeover,with a proper SmileAnalysis,and the expert hands you will achieve that smile you always wanted,its a combination of shape,size and even color,with this you will improve the way you look,your smile and your confidence,its time for a new you!