Growing in an LST (low stress training) manner as mentioned by
@Roberts will increase your yields BUT with growing so close to the ground and having the leaves touching the ground you just invite fungi, pests, and disease into your plant which will inhibit growth and decrease yield!! the smallest opening into your plant like a small cut or even a cut leaf can easily be infected with Botrytis (common plant disease) which will kill your plant in matter of a week or two sometimes even days!
Try giving your plant at least 1.5-2.5cm of space between the foliage and the ground to prevent that!
Other than that your plants look great!
Hope this helps! Good luck and happy growing :)