I haven’t participated in the challenge for a while but the challenge to make a duo tangle using our initials sparked my interest. I decided to use two official zentangle® tangles – cadent and shattuck, both grid type tangles, which I usually avoid.
Interesting to see all the tangles people choose to use, such a good selection of tangles to see in one place. Visit Laura’s site to see this amazing show of tangles. I Am The Diva, CZT
Laughing Orchid Studio 
Beautiful tile, and glad you pasted this work. Nice tangle composition, and great shading!
They don’t look at all grid like the way you have done them — very pretty — I’m going to learn from your tile how to ungird the grid patterns.