That slight discoloration I've seen on a few strains, usually with purple or blueberry genetics in them, for some reason they just do that.. no biggie. The structure on yours is for sure heavy Indica dominant. And looks like size will be on the smaller side like your wanting.. I'm also doing my 1st Auto grow and was so surprised how big mine got.. for sure the AK47 coming out as some of the leaf material is thin and pointy like a Sativa would be. The stretch I got between day 20 & 40 was amazing. Probably have 65-70 days in for them to finish up proper. I've heard great things about the Sour60 mixed in with this, and the little test nug we did was amazing. My eyes actually turned red like back in high school... lol. I was debating on what to start next... Lemon Diesel Auto is on my mind, but so is a non-auto Bubblegum by BOG.. so many seeds, so little time.. peace
P.S. to all those who still think Auto Flowering Strains are small.... hehe. 3ft tall and swelling up now..
good luck man.. I'll be watching. Making seeds of this stock also...