Added a BIT of depth following the lines of the sketch.
step 4 of 6
Start darkening the flower's shadows to give it shape, more shadowing everyone else.
step 5 of 6
step 6 of 6
Use different sizes and opacity brushes for different desired texture on each. For earth I used pen tool and went a bit crazy ;)
I did lots of detailing with a simply brush, low opacity and worked section by section!