Everything is looking healthy and green! If you want a nice carpet plant give HC a try in the foreground. It grows shorter and denser than HM. Keep the HM where it is, it's a good mid ground plant and it's filling nicely.
Moving the middle stem plant to the back left or right might balance out your scape a little. I have some java trident you can tie to the wood.
I haven't tried miracle grow so I'll be keeping a close eye on your progress!