Ass 1 - Further into the element designing

After coming up with the tiling and puzzle idea,I decided to make my puzzle pieces cleaner and more professional. Here's an example of the progress :

#1 is what I started off with with all the puzzle pieces and then the progress was made. I'm still unsure if I should use the pieces with the rounded square edges (#2) or use the 'naked' pieces instead (#3) for my final composition. However I'm pretty set on the designs themselves and would be using this and four other designs to make my final composition.