I can't tell much due to the pictures as there not up close. You look like your a few weeks away from harvesting. This is what we call the fade. Typically feeding schedules tend to wrap up 2 weeks before harvest. Please check the breeders info on when you should harvest outdoor. If your in the 7-9 week range your should be harvesting late sept early oct. This being an alaskan strain I'd put my money on the last week of sept. If this is the case then I would recomend only watering your plants from hear on out. They will fade to yellow and by the time you harvest they will look like utter shit but this is normal. This is the type of stuff you won't see on a high times cover as most new growers tend to want to harvest their plants green. Please do not do this as your bud will taste like crap and not stay lit due to nutrient salts still being in your bud. You look like your doing all right and for some leaves to yellow and fall off are very normal during the later stage of flower. For more on the fade read this article. Good luck and have a happy harvest. https://www.skunkmagazine.com/the-fade/