Your stitches look flat but are thoroughly illuminated. Incident light occurs when the light source is to one side of the magnifier. Hold the flashlight directly over the piece and you can see shadowfree illumination. The type of light you prefer is a personal, and important, choice 2. Be aware that different types of bulbs generate different amounts of heat.
Fluorescent bulbs are the coolest.
Incandescent are hot. Halogen and High Intensity bulbs are really hot. Some high intensity lamps can burn you or something else if touched. Glass is heavier than acrylic, can be optically ground into a more perfect magnifier, and is more expensive than acrylic. Physical lens size and strength of magnification determine how much of your work you can see at one time under the lens.