Honest opinion. The series seems to be really good so far.
As for the questions on the last page, the latter part having less dialogue seems to fit more as the saying “a picture tells a thousand words” applies.
Also, since you said you aren’t a writer I would suggest not trying to info-dump on the reader and making a huge wall of text as that can be hard to construct.
The backgrounds are fine. More than fine actually, they are really good. In all honesty, this seems really good for a series considering many other series use 3D models or AI for large portions of their works so…. Yours is really good.
I’d advise you to choose one between the Isekai and the original world if you’re planning to stop it early. Although it is appreciated and loved if you put detail and attention on the main character in his original world, if you put too much emphasis on the Main Characters original life then it could very easily overshadow the Isekai.
Note: I am not a writer. So please take all my opinions with a grain of salt