Nice looking youngling you got there burn.
It would be great to see some pics in a more natural light, which helps to gauge plant health and gives a a better picture to enjoy your hard work.
Let me give you a link which will help you take better pictures under HPS -
Better Pictures Under HPS just click the link.
You can also take some snap just after lights out with a flash or use some daylight cfls for good colour rendering and also avoids that stark shadow you get with flashes.
You will need to be careful with you compost as it has what is termed smart release fertilizer in it , which is most probably a slow release fertilizer and they recon it last for 12 weeks. Not ideal but you have to go with what you have.
With your next grow I would use a cannabis targeted compost and a get some nutes for veg and bloom.
Have a good read of other journals and you'll soon see what other members are using and you can ask they how they find their particular chosen products.
Compost and nute brands vary depending on where you are like the US or Europe and some brands cover both continents.
You will still get some nice buds using what you have but you next grow will be greatly improved with cannabis targeted compost and nutes.
I look forwards to your future posts
happy growing bro
arty