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I found a similar.question here on stackexchange, but I can't properly
understand the answers given there. And the textbook _Genki_ doesn't give much
of a detailed explanation on the plural form.

What I've got so far is たち - the ultimate suffix which helps to make the word
plural, for example 私たち or あなたたち.

I think it only works with pronouns? If so, can it be loosely translated as
"and company"?

But then how can I form the plural form of other words? As far as I know it's
not right to add this suffix to every existing noun to make it plural.

For example, if I want to say "pictures", would that be something like 絵画たち or
絵画ら? Or are you supposed to find a proper kanji that represents the plural
form in this case?

The other way I know of doing this is to just "double" the noun like this: -
やまやま. ２ｘ山 = mountains, right? But does it work for the example above?

And what about ら, eg. かれら. Can it be used for living things etc. as well?

Finally, can you use this way of turning words into a plural form in a
formal/informal context?
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2015-06-22T10:14:29.733
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question
word-choice suffixes plurals morphology
Plural form with -たち／-ら
I am convinced you are already aware that Japanese has no plural construction
for nouns, adjectives and verbs in general: the Japanese (speaking people)
have to guess from the context, hence prone to misunderstanding.

That said, I will write down individually.

Pronouns are easier to handle as you wrote.

私 -> 私達（わたしたち）or 我々（われわれ）

貴方・貴女（あなた） -> 貴方達・貴女達（あなたたち）

彼（かれ）・彼女（かのじょ）-> 彼等（かれら）・彼女等（かのじょら）

それ -> それら

But for nouns? Ugh...

I remember some math books writing 元たち for elements, ベクトルたち for vectors, etc.
(元 is an "element" and ベクトル is a "vector.") Frankly, I don't feel at ease with
these constructions.

Of course I can say 元(複数）or 複数の元 or 多くの元, but it is cumbersome. Sometimes your
construction 山々（やまやま） works as in 人々（ひとびと） but not always: for example, 川々
sounds awkward.

I know what I wrote is far from what you hoped to get. I am sorry I can't come
up with a satisfactory (re)solution of this situation.
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It is not that it can't be used with nouns. It cannot be used with anything
that is inanimate. Thus, since a picture is inanimate, 絵画たち would be
ungrammatical. You should just use 絵画 regardless if it's just one or many.
There won't be misunderstandings if the number isn't important, and if it is
important, you should specify it, even if the number is general (like 数).

Also, I disagree with 達 being called a "pluralizing" suffix. X達 means
something like, "the group of people that includes X", which is different from
the English plural. The English plural means there are two or more of the same
thing, whereas 達 doesn't imply that. "Students", for example, means there are
several students, but they are _all_ students; 「学生たち」 means "the group that
includes the student", meaning there's at least one student, but not
necessarily all of them. Of course, in reality, it's _likely_ they're all
students unless context hints otherwise, but it doesn't have to be that way.

Unlike English, Japanese doesn't usually care about the number of things to
begin with. In English, you're always required to give a hint at the number of
the item, even if it's unimportant. In Japanese, there is no such requirement,
and listeners will guess from context what the number of the item is if you
don't give them the number.
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