Yep. Normally artist won't put them there because it looks weird (for anyone who didn't know human biology nor seen boobs irl), but ones that goes extra mile like this deserves a prize.
That's one thing more to be remembered- if you looked at cosplay photos and they didn't have these, then it's one of three scenarios: one, they touched up their breast with photoshop. Two: foundation. Three: lack of lighting.