I've wrote a tutorial for this icon. You'll probberly think "WTF? This girl does icons really weridly!" Well *sticks out tounge* I don't care. So here it is!
{ #1 Willow Icon Tutorial }
We'll start with this base:
Layer One > Adjust > Sharpness > Sharpen.
Layer Two > Use This Gradient and set it to 20% opacity.
Layer Three >Use this brush and set to 20% opacity.
Layer Four > Then Use this brush and set to 20% opacity also.
Layer Five > Layers > New Adjustment Layer > Brightness/Contrast > Set "Contrast" to 40
Layer Six > Layers > Merge > Merge All (Flatten)
Layer Seven > Use this brush again and set to 20% opacity.
Layer Eight > Layers > New Adjustment Layer > Brightness/Contrast > Set "Contrast" to 40 > set to "Darken"
Layer Nine > Layers > Merge > Merge All (Flatten)
TA-DA! You Should have this:
Tell me if this was helpful and if you need anything explaining or even if I missed anything out!