The picture is a little difficult to see the details of the house but you could obviously paint it (I would recommend a darker, more saturated color), add some wood detailing to the exterior to create a contrast, change out the planter boxes to be more modern, change the entry door to a more modern looking one, switch out garage door to one that has frosted glass panes and is trimmed out in wood. Oh, and you could add some more modern light fixtures/lighting. Good luck!
Though it may be a small detail, an easy way to upgrade and modernize your home's curb appeal is by adding a new high-quality handleset (like these here). You can even kick it up a notch by adding a battery-operated keyless deadbolt (like these). Say goodbye to the hassle of keys and hello to freedom (cue happy dance)!
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armstrongaia
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Schlage Locks