Darlyn T wrote:
I did my own makeup for both of the images here that I have on MM (I shot more images from that shoot but I have not received them yet). My issue is with the image that I have for my avatar.

I'm sure that I had put on a good amount of makeup for photography. Maybe it's the products that I bought.

Here's a list of makeup that I wore for that particular image:

L.A Colors "Glossy Lips" Sheer Lipgloss

NYX "Love in Rio"

Iman Cosmetics Luxury Radiance Liquid Makeup

Ulta Cosmetics Red Lipstick Shade number 202

Flori Roberts Corrective Concealer

I realize that I can hire an MUA but I need to know how to do my own makeup regardless.

If someone can recommend better products than what I used above, I'd gladly appreciate it.

It's not your make up. It's the way you've been shot.
Usually the problem with darker skin tones is the foundation doesn't match well, and you get this obvious change in colour around neck lines.
In your photos it doesn't seem to be the case but more a lighting/temp and saturation/contrast issue. Just my 2 cents worth