Nice article, been still hunting for close to 50 years. Total camo is overrated for an upright walking individual, movement and seeing first is most important. Camo helps don't get me wrong but it's not number one.
Most do not understand how easy it is to see camouflage when its moving. Stay in shadows if possible. Keep your face in the wind.
When you think you are moving slow enough, slow down. Take two or three steps then look over every leaf in your sight before moving. You need to see them move before they see you. Look for blinking eyes, nose twitch, ear twitch any movement at all.
Remember every creature likes to take the path of least resistance and greatest cover, valley, draws, funnels. Stay out of them where possible and observe them and you will see more animals. But, do not skyline yourself. Better to be down in the funnel rather than skylined.skylines.
Remember a deers side of head mounted eyes give them a massive field of vision advantage over your forward mounted predator eyes.
Practice will never make you perfect. But it will damn well help. .