Yes, yes, definitely, it's okay. I like the design, actually. :) But it would be nice to have the touch of a professional, if you can.

I would say that your choice of cover design as a whole denotes elegance and taste. Look at the cover design of graphic designer Manuel Estrada:

https://estradadesign.eu/project/alianza-editorial/

Your cover remind me of that kind of style.

There are some details about the typeface, layout, and the photograph that, as somebody with a certain background in graphic design, I can perceive as a little bit off.

The photograph was chosen because I could not find other computer books with that somewhat harsh color scheme, and you gotta stand out :)