Abs only showing in certain lighting?

I don't know if this is normal but I feel like I have fake abs and sometimes people think I photoshop my abs?

I don't have the most defined abs but it kinda shows with proper angle and lighting, but will be gone if I eat a lot or light straight ahead.

Are these proper abs or not? I'm not sure if I actually have abs or fake abs? These are some reference for good lighting and normal lighting:

Normal without posing: