Though I missed getting this challenge in on time, I did do it. lol 

The challenge was to take a tile from when you began and draw a new one to see how far you have come in with your zentangle drawings. Well however late here are mine;

These are about 4 months apart. 

The 1st being done in Dec. 2015 and the 2nd was done in April 2016.

They both feature; Phicops, Ipso, and Xplode