Thank you so much! I mostly used a basic round brush with pen pressure, with "Transfer" settings on. I used a soft round brush occasionally for softer transitions. I did use a speckled brush to get a subtle effect on the eggshell and the very last texture, and then I painted in more tiny details on top when needed. For this, I really focused on figuring out how to paint the textures so I tried not to use too many custom brushes. But now I want to make my own brushes to make the process quicker. Hope this helped a little.
Transfer is a brush option in Photoshop. Basically though, it would just mean that the brush responds to tablet pressure, so if any brushes in Corel Paint are pressure sensitive, it would have the same effect. The brush becomes less opaque with less pressure. In reality, it's great to just use normal brushes and try to capture the look of the texture or material with what you have. I recommend it, it's a great challenge to try, and you can learn new techniques. I just used objects in front of me and a few photo references to study.
Thanks! For reference for the materials here, I used photos of various objects for some, while some were referenced from life from objects around my room. The dark glass and blue plastic, for example, were from a shiny dark brown ink bottle and a plastic spray bottle. For others, I browsed through the stock images here on deviantart for different interesting surfaces to study. [link]