First, this is a tutorial intended to teach people from your work, so why are you trying to keep them from seeing your work? You made all of the images rather small, and you disabled the download feature. This means that if someone likes your tutorial, it is slightly harder for them to keep it on their computer for personal reference. It also means that they cannot see what you are demonstrating quite as easily. In addition, you put large copyright marks in the middle of most of the images, without even turning down the opacity. This means that while everyone is squinting to see your small images, their view is also being blocked by the text.
I appreciate copyright marks, and my point is not that you should not use them. I know that it is often a touchy subject, because occasionally I have seen people become angry that the one suggesting the copyright is distracting is actually trying to steal the image. In all the cases I have seen, that isn't the case, but that is still not my point. 1. I doubt anyone is going to try to steal such a tiny copy of an image 2. a transparent copyright mark protects you just as well as one with full opacity, but it is much easier for your average art-appreciator to admire your work around it 3. if you really mean to help people, then are you really not willing to allow one drawing to be used by your students, or for your students to keep your tutorial somewhere they will realistically be able to access it?
My suggestions: 1. keep putting on copyright marks, but make them transparent so we can see around them, and make them cover the whole width of your tutorial every so often. Then people will remember that you made this, they will not be able to claim it as their own, it will make you look less afraid while still cautious, and it will allow your audience to appreciate your work more. 2. Let people download it. It lets people see it at a larger size, and it makes it easier for them to keep it on their computers where they can come back to it more often than they likely will if they must dig through their favorites on DevArt. Besides that, remember that it really is not difficult to download an image without DA's permission anyway, but you look like a nicer person if you give people the offer yourself. 3. If you are really concerned with theft, then you may consider designing your own copyright mark with a symbol involved, or with a more rare font. While I doubt there are many who would bother, it is theoretically possible to take off a copyright mark if you can reverse the effect (or if you are very patient and the image is regular enough)
I offer this only because I feel like you might learn something from my suggestion and my observations. If you dislike what I had to say, then hide this comment and forget about it, but know that I said it with the best of intentions, to offer my experience and my thoughts.
Also, in your description, it should be "I was asked to make a tutorial on how I draw starclan cats" if you care. I know that it is hard to learn another language, believe me, I've been there and I often make a huge fool of myself
Good luck to you. (Viel Glück für Sie? Ich denke dass ist richtig.)