Ljósmyndin sýnir vatnstjónið.

Because Icelandic usually puts the definite article onto the end of the noun instead of using a separate word like English the.

• ljósmynd = photograph

• ljósmyndin = the photograph

• vatnstjón = water damage
• vatnstjónið = the water damage

So in this sentence, both nouns are definite:

• Ljósmyndin = the photograph
• vatnstjónið = the water damage

• Ljósmyndin is the subject, so it is in the nominative case.
• vatnstjónið is the direct object, so it is in the accusative case.

So the structure is:

• Ljósmyndin = nominative singular definite
• sýnir = shows
• vatnstjónið = accusative singular definite

A useful point: for many neuter nouns, the nominative and accusative look the same in the singular, which is why vatnstjónið does not visibly change here.

Sýnir is the 3rd person singular present tense of the verb að sýna = to show.

Since the subject is Ljósmyndin = the photograph (a singular thing), Icelandic uses the singular verb form:

• að sýna = to show
• ég sýni = I show
• þú sýnir = you show
• hann/hún/það sýnir = he/she/it shows

So:

• Ljósmyndin sýnir ... = The photograph shows ...

• ljósmynd is feminine
• vatnstjón is neuter

You can see this in the definite forms:

• feminine singular nominative definite often ends in -in

  • ljósmyndin

• neuter singular definite often ends in -ið

  • vatnstjónið

Knowing the gender matters because it affects articles, adjective endings, and sometimes declension patterns.

Yes. Icelandic very commonly forms compound nouns, often where English would use two words.

Here:

• vatn = water
• tjón = damage, loss

Together:

• vatnstjón = water damage

The s in the middle is a common linking element in compounds. English learners often find Icelandic compounds long, but they are very normal and productive.

This sentence uses a very basic subject–verb–object pattern:

• Ljósmyndin = subject
• sýnir = verb
• vatnstjónið = object

So it looks very natural to an English speaker:

• The photograph shows the water damage.

Icelandic does have stricter verb-second behavior in many sentence types, but in a simple main clause like this, the word order can look quite familiar.

You would normally remove the suffixed definite articles:

• Ljósmynd sýnir vatnstjón.

That gives an indefinite sense:

• ljósmynd = a photograph / photograph
• vatnstjón = water damage

Icelandic does not have an indefinite article like English a/an, so the bare noun often carries that meaning.

A rough English-friendly guide would be something like:

• Ljósmyndin ≈ LYOHSS-myn-tin
• sýnir ≈ SEE-neer
• vatnstjónið ≈ VAHTNS-tyoh-nith

A few important pronunciation notes:

• ljó begins with a sound somewhat like lyo
• ý is pronounced like a long ee
• ð is like the th in this or can sound softer depending on position
• Icelandic pronunciation is not always obvious from spelling, so listening to native audio is very helpful

Because the ending of the definite article depends on the noun’s gender and case.

Here:

• ljósmynd is feminine, so the nominative singular definite form is ljósmyndin
• vatnstjón is neuter, so the singular definite form here is vatnstjónið

So the different endings are not random; they reflect the noun’s grammatical gender and declension pattern.

Sometimes, yes, depending on context.

• mynd can mean picture, image, or photo in many contexts
• ljósmynd is more specifically photograph

So:

• Myndin sýnir vatnstjónið could also work if the context already makes it clear that it is a photo or image.
• Ljósmyndin is more precise if you specifically mean a photograph.

This sentence is a very useful model for several core Icelandic patterns:

1. Definite article attached to the noun

   • ljósmyndin
   • vatnstjónið

2. Basic subject–verb–object word order

   • Ljósmyndin sýnir vatnstjónið.

3. Present tense verb agreement

   • sýnir for a singular third-person subject

4. Compound nouns

   • vatnstjón

5. Gender matters

   • feminine ljósmynd
   • neuter vatnstjón

It is a short sentence, but it contains several very common Icelandic grammar features.