Smart ForFour AMG Black Series Night Edition Premium Plus 125 Powered by Brabus
My C32 has standard suspension and is maybe a touch lower than yours judging by the photos, but not much.
Andy's (andy_cyp) looks great and really fills the arches with the aftermarket springs and 18 inch wheels - makes mine look like it's walking on it's toes!!
If you can change the springs yourself, or know someone who can do it for you for a favour it might be worth lowering it - if it's important to you.
If you're relying upon a garage it may not be worth the cost - especially if it's for aesthetic reasons only (not for handling reasons) - as IMHO your car looks great as it is.