Use pen tool to make the net (make a small part, then duplicate many times)
step 4 of 15
Distort the net
step 5 of 15
Cut some bulbs from the source then put them into the net
step 6 of 15
Select different bulbs to make the variation, just duplicate and put them in different space to fill the net. Use blending mode to make the shadow and inner shadow for each of the bulb, then you don't have to care anymore about that
step 7 of 15
Draw halve of the heart
step 8 of 15
make the heart glow
step 9 of 15
Make the heart glowing more, and put some bulbs along with the road, make them glowing, too