Next time you might try to angle the flower boquet into the shot. Gives some dynamic interest. And I think it would help the picture to have cropped out or recomposed to remove the lines.
There is a stark and offbeat quality to this shot that appeals to me. At first I was inclined to critique the unbalanced placement of the flowers at the top of the frame and dismiss the line of grout as a distracting element. However, the more I look at this the more I like it. I can actually imagine enjoying viewing this in a gallery frame. It is likely a happy accident but thanks for sharing it.