They look good to me man, a lot better than the autos I've got going right now at about 8 weeks. This is my first attempt with autos and none are over 8-10 inches, some are barely six. I was completely unprepared for how fast they would start flowering. All I've done before now have been photo period seeds or just old bag seeds in a thrown together attic grow. I'm gonna try again later with the seeds I had left but I'm definitely gonna do bigger pots next time. Mine stayed in solo cups wayyy too long and are stunted cause of it.
On a side note, I've got 4 White Widow, 2 Lemon OG Haze, 1 Ak 48 and a blue mystic. All from Nirvana. I planted 5 WW, 5 lemon og, 4 ak and 2 BD..... I'm a little disappointed, I'd heard how fast the ak grows and was looking forward to an early finish for them, unfortunately they wouldn't germ for shit, only had two pop and one of them died early on.
2 of the ww are tal and lanky with severely underdeveloped leaves.... any idea what could be causing this? The other ww are looking good other than being small but I'm thinking that's from my undersized potting.
Cheers man, yours look great to me