उसके चेहरे पर चमक है।

A very literal breakdown is:

• उसके = his / her / of that person
• चेहरे पर = on the face
• चमक = shine / glow / radiance
• है = is

So the sentence is literally:

On his/her face, there is a glow.

That is a very normal Hindi way to express something like His/Her face is glowing or There is a glow on his/her face.

Because Hindi possessives का / की / के agree with the noun that follows.

The base noun is चेहरा (face), which is masculine. If it were in its simple direct form, you would say:

उसका चेहरा = his/her face

But here the noun is followed by the postposition पर (on), so चेहरा has to change into its oblique form:

• चेहरा → चेहरे

Once that happens, the possessive also changes:

• उसका चेहरा
• उसके चेहरे पर

So उसके is used because चेहरे is in the oblique form.

This is because of the oblique case.

In Hindi, when a noun is followed by a postposition such as पर (on), में (in), से (from/with), or को (to), the noun usually appears in its oblique form.

For many masculine nouns ending in -आ, the singular oblique changes to -ए:

• लड़का → लड़के
• कमरा → कमरे
• चेहरा → चेहरे

So:

• चेहरा = face
• चेहरे पर = on the face

पर is a postposition meaning on, upon, or sometimes at.

Hindi uses postpositions, which come after the noun, unlike English prepositions, which come before it.

So:

• English: on the face
• Hindi: चेहरे पर

In this sentence, पर is very natural because the glow is understood as something visible on the face.

Because Hindi often expresses qualities with a noun + है structure.

Here, चमक is a noun meaning shine, glow, or radiance. So चमक है literally means there is glow / there is radiance.

This pattern is common in Hindi:

• उसमें ताकत है = He/She has strength
• उसकी आँखों में चमक है = There is a sparkle in his/her eyes
• उसके चेहरे पर चमक है = There is a glow on his/her face

So instead of saying something like His face is glowy, Hindi often says There is glow on his face.

Because Hindi normally puts the verb at the end of the clause.

So the sentence follows a typical Hindi pattern:

[location/topic] + [thing/existence] + [verb]

Here that becomes:

• उसके चेहरे पर = on his/her face
• चमक = glow
• है = is

Hindi does not need a dummy subject like English there in There is a glow. The idea of existence is simply expressed with है.

It can mean his, her, or sometimes its, depending on context.

Hindi third-person possessives often do not show gender the way English does here. So:

• उसके चेहरे पर चमक है could mean
  
  • There is a glow on his face
  • There is a glow on her face

You usually learn the gender from context, from earlier sentences, or from the person being talked about.

It is completely natural Hindi.

In fact, it sounds quite elegant and descriptive. It can be used for:

• physical glow
• healthy radiance
• happiness showing on the face
• excitement or confidence visible in someone's expression

So it is not awkward or overly literal. It is a very normal sentence.

It can be both.

It may describe a literal glow, but very often it is metaphorical and means something like:

• the person looks happy
• the person looks healthy
• the person looks radiant
• their face shows excitement or joy

So if someone has just received good news, उसके चेहरे पर चमक है could suggest that happiness is visible on their face.

The two are similar, but not identical.

उसके चेहरे पर चमक है

• literally: There is a glow on his/her face
• sounds descriptive
• can be literal or figurative
• often focuses on the visible radiance as a quality

उसका चेहरा चमक रहा है

• literally: His/Her face is shining
• emphasizes an ongoing action or visible effect
• can sound more immediate or physical

So the first sentence feels a little more like there is radiance in the expression, while the second feels more like the face is actively shining/glowing.

You could, but it is not the same in tone.

चमकीला is an adjective meaning shiny, bright, or glossy. It often sounds more like a physical surface quality.

So:

• उसके चेहरे पर चमक है = there is a glow/radiance on the face
• उसका चेहरा चमकीला है = the face is shiny/bright

The first is often more natural when talking about beauty, happiness, freshness, or expression. The second can sound more physical or surface-based.

Yes: this sentence shows two important Hindi patterns at once.

1. Oblique case before postpositions

• चेहरा → चेहरे पर

2. Possessive agreement with the following noun

• उसका चेहरा
• उसके चेहरे पर

So this is a useful model sentence because it teaches you how Hindi handles:

• possession
• postpositions
• noun case changes
• existential है sentences

It is a small sentence, but grammatically it is very rich.