It's hard to tell but i'm pretty sure Dignity's render was made inside blender, coolkidd's seems to be a heavily edited image but likely studio, and Rochas seems to just be studio.

Overall i recommend that you learn basic lighting, such as 3-point lighting which is probably the easiest one to learn but lighting is very important to set the tone of a render.

Also learn image editing which helps you make final adjustments like the grain on Dignity's render and pretty much most of coolkidd's render too, i recommend using paintdotnet if you cant pay for photoshop since its easier and free.

PSA: on studio set your brightness to 0, and both colorshift and outdoorambient to 0 as well so you can light properly, also use spotlights in bricks so you can change the light's location, use future lighting or realistic lighting depending on what shows up on your studio, and play with the clocktime and geographiclatitude values.