I like the "feel" of the rings and waterfall. Like they're drawn in pastels. The waterfall texture would look good on an ice sculpture. Try adding point lights to illuminate the lady's left arm and under her chin. Also add some lighting to show up the tree trunk a little. Disable shadows in each of the lights to ensure that the scene still looks "normal". Finally, change the lady's clothing as what she's wearing doesn't look waterproof. ;-)

Cheers,
Mark