To echo everyone else, things actually look fairly standard to me. You just hit week 6, that's when things are going to finally start filling out for you. I'm at week 6 currently as well, although some of my buds have filled out a bit more that's because I'm growing in larger containers and using CO2.
But again, you're looking really good and things look exactly as they should. For next time, if you want larger buds I'd upgrade the light for sure. A 600w does best in a 3ftx3ft sqft area, your OP says you're in a 1.2x1.2 (meters I'm guessing?) which is just shy of 4ftx4ft sqft area. You'd get much better results out of a 1000w light for sure. If you're wanting those big fat buds that you see some people post on here you'll definitely need to get yourself a 1000w bulb for sure. Increasing the size of your pots/root mass will also help with getting bigger buds. Just veg for less time if you're concerned about running out of room. If it took you 3 weeks of veg to get the plants that big in 20L pots with 600w light then 25-30L pots (I'm in the States, don't know liter sizes for a 7g pot, sorry!) under a 1000w light could potentially give you the same growth with 2 weeks of veg. Even though the plants would be grown to the same size, the plants would have larger root masses and an extra 400w of light to play around with resulting in larger and denser buds.
Again, to echo everyone else, does look more like a sativa pheno to me. Looks just like my sativas do right now, all of my indicas are starting to get brown pistils where as my sativas still have mostly white pistils. Might end up being a 9-10 week strain instead of 8-9 weeks.
You should be able to pull 2-3oz per plant from that set up though. 4oz per is also quite possible depending on your skill and the strain, the girls certainly look healthy enough to pull 2-3oz each and you definitely have enough light for it. I'm not going to say for sure (just because I never like to "guarantee" yields) but if I had to guess you should pull 1/2lb total quite easily. A 600w can pull 1/2-1lb depending on the strain and grower.
Hope it all goes well and keep at it, looking good my man!