I have a problem in photoshop CC 2023 two if the mixer brushes (mixer and kev) act exactly like regular hard brush would. Is that normal? help welcome

Here, I’m following along by drawing the wireframe of the apple and trying to stylize its look and feel.

This is a study in Oil. I used a photo from one of my artist reference books. I was also attempting to play with referring to darker areas that may have a more blue tint than a sienna or umber. I utilized Pthalo Blue as the base layer in those areas. For the Skin tone I used Naples Yellow and Umber in the lighter layered areas. I mostly stuck to those 3 colors only utilizing Black for the hair. I didn't focus on anything in the background as I was simply playing with color and completing a "portrait" study. I'm just seeking any relevant feedback as I am trying to.improve and "get back on the horse"......Thank!