Honestly, had I not seen the title, I would not have known those were ants. You could have gone in a bit closer with a different lens or by moving in. There is also plenty of room on the picture to increase the size of the flowers with editing. So, since you probably can’t redo the shot, try cropping away the outer parts of the picture all the way around which should increase the size of the center of the picture showing more detail. You didn’t give the camera settings, which is always helpful, but if you used a low ISO, you should be able to get a bit closer to the flower without a loss of clarity.