Even though this is about infographics, there is a lot of useful information here: https://blog.datawrapper.de/beautifulcolors/
Wording is sloppy, too ("into an email attachments"?).
"into an email attachments" doesn't agree on number--it should be "into an email attachment" (singular) or "into email attachments" (plural).
It's not 100% clear that by "shrink" you mean "reduce file size" rather than "visually scale the image".
"Batch image resizer which will make photos smaller enough to fit them all into email attachments. In three easy steps."
Don't use the comparative form of the adjective "small". "Which" is not needed here either.
"Batch Image Shrinker reduces the file size of a group of images in three easy steps:"
That's a start at least. I hope that helps a bit.
i also kind of feel like your comments distill down to something very close to:
"there's no right way to do it, but that way is wrong"
design is inherently subjective. no single tool will seem "right" to everyone, and that's ok.
It's a really common misconception among technical folks that "subjective" == "arbitrary".
Design is inherently subjective, yes. But that does not mean that all design choices are equally good when goodness is measured by pleasing the greatest quantity of users by the greatest amount.
Ice cream flavor preference is subjective too, but if your ice cream shop only sells "sawdust sprinkles" and "frog's blood", business isn't going to go well for you. Or, perhaps closer to home, the choice of keywords in a programming language is entirely subjective. The compiler does not care if you use "while" or "rkdhx" for loops, but good luck convincing programmers to adopt a language that chooses the latter.
Designers have laboriously learned the aesthetic principles that align with how our visual system works and with the expectations users have coming from our shared culture's graphic history. That's what they mean when they say something is "right" or "wrong", and they have a lot of expertise to back it up.
But who is advancing all those arguments you are refuting?
They are all straw men.
As someone mentioned in this thread, look up US WDS advice on color. It’s a lot more objective.
Second this author is basing the advice on this app: https://play.google.com/store/apps/details?id=net.amortizedc...
Again I am not an expert and I don't mean to be rude, but that's not a very nice looking app in my opinion. The colors, fonts, alignment, spacing, etc all seem just a bit "off".