Phone cameras tend to ramp up the saturation.
It gives the photo a more vibrant look, which many people prefer, at the expense of color accuracy.
But generally with artistic photography, you're going more for a style than for accuracy, so I wouldn't say it's always a bad thing (though sometimes it is).
[[Giant Growth]] is +3/+3 at instant speed for 1.
So for 1 more you're adding trample, hexproof, and indestructible. That's a sweet deal. Hugely versatile.
As long as you've got the mana to spare, this seems like a clear upgrade.