Well first, I gotta know you're set up. So you got CSP -- a very good art program. But how are you drawing in it? Are you using a mouse? Do you have a tablet?
Right now, I have a small tablet. It's not a touch-screen or anything, but it does the job I need. When I first tested out CSP, I went through the different brushes to find a consistency I liked. Then, I went to their asset shop to find more brushes.
I also work with a lot of assets, mostly for backgrounds and extra details I don't want to spend too much time creating myself. For instance, with this picture here -- you created a small hatch shading along the neck. There are assets in CSP that give you stronger hatch shading, even adding in depth. Though, because you just started, I would hold off on using these for a little bit until you get used to generally drawing in CSP.
Also -- do you have any prior experience with digital art in general or is this just your first rodeo? If so, that's chill too. Because there are a lot of tricks you can do to improve your art that's kinda seen throughout most art programs. For instances, using the different modes when shading can help with light and color based on the flats you pick. Here's one website that talks about it.
Generally, a lot of people shade purple or blue and set that to multiply, but I generally use a soft reddish color and set it to Linear Burn and play with the opacity.
I would also look up "how to shade" in general for most art programs. The systems might be different, but the advice is generally the same in terms of how to shade and what modes can work.