Watch the D7 sus 4 Tuning online guitar lesson by TrueFire from Play Acoustic Guitar 9: Advanced Style Diversity
D7 sus 4 Tuning - Breakdown is a video guitar lesson presented by Vicki Genfan and is sourced from Essentials: Open Tunings.
Can you get the 12th fret harmonics to really ring out using your pinky? It may take a bit of practice, but make sure you keep your pinky straight and let the harmonics ring out, don't cut them off accidentally. Once you've figured this one out, play around and see if you can find other configurations using the 4th and 5th strings over the D bass note that sound good.