Hi, so regarding the buds, is it normal for some hairs to quickly turn orange or brown? It's also normal that they aren't thicker yet; it just takes a bit of time.
But if you're talking about brown spots, I don't see them in your photos. As
@organoman says, a few better photos would be helpful. But those spots could become a problem.
Rusty-brown markings on the lower leaves of cannabis plants can indicate various causes:
pH fluctuations: An unbalanced pH in the soil or water can hinder nutrient uptake and lead to such symptoms. So you should check your runoff, and the pH should be between 5.8 and 6.5.
Over-fertilization: Too much fertilizer can damage the roots and cause brown spots on the leaves. Again, check your runoff, and not just the pH but also the EC, which should not exceed 2.
If both values are okay, it could also be a nutrient deficiency, likely a lack of potassium, magnesium, or phosphorus, which can cause such discoloration. These nutrients are essential for the healthy growth of the plant.
So please upload a few more photos of the problem areas in your diary/question and check the points above.