يظهر الطبيب في الصورة.

A fully vocalized version is:

يَظْهَرُ الطَّبِيبُ فِي الصُّورَةِ

A careful pronunciation is approximately:

yaẓharu aṭ-ṭabību fī aṣ-ṣūrati

A few notes:

• يَظْهَرُ = yaẓharu
• الطَّبِيبُ is pronounced aṭ-ṭabību, not al-tabību
• الصُّورَةِ is pronounced aṣ-ṣūrati, not al-ṣūrati

In normal pause at the end of a sentence, speakers often drop the final short vowel, so you may hear something closer to:

yaẓharu aṭ-ṭabību fī aṣ-ṣūrah

يظهر means appears, becomes visible, or is visible, depending on context.

In a sentence like this, it often has the sense of:

• appears in the picture
• is visible in the picture
• can be seen in the picture

So it does not necessarily mean a dramatic shows up. It can simply describe what is seen in the image.

The prefix يـ marks the verb as third person masculine singular in the imperfect tense.

So يظهر means:

• he appears
• he is appearing
• sometimes, depending on context, it appears

In this sentence, the subject is الطبيب = the doctor, so the verb is he appears / is visible.

Because Arabic often uses verb-subject order, especially in formal written Arabic.

So:

• يظهر الطبيب في الصورة = a normal verbal sentence
• الطبيب يظهر في الصورة = also possible

Both are grammatical, but they can feel slightly different in emphasis:

• يظهر الطبيب... focuses first on the action/state
• الطبيب يظهر... puts more focus on the doctor as the topic

طبيب means doctor.

Adding ال makes it definite:

• طبيب = a doctor
• الطبيب = the doctor

Arabic has no separate word for a/an, so the bare noun often carries that meaning when it is indefinite.

Because ط and ص are sun letters.

When ال comes before a sun letter, the ل is not pronounced, and the following consonant is doubled.

So:

• الطبيب is pronounced aṭ-ṭabīb
• الصورة is pronounced aṣ-ṣūrah / aṣ-ṣūrati

This is only a pronunciation change. In writing, ال stays the same.

In full grammatical form:

يَظْهَرُ الطَّبِيبُ فِي الصُّورَةِ

The endings are:

• يظهرُ: the verb is in the indicative
• الطبيبُ: nominative, because it is the subject
• الصورةِ: genitive, because it comes after the preposition في

In everyday unvowelled Arabic writing, these short vowels are usually not written, but they are part of the grammar.

Because it comes after the preposition في, which means in.

Arabic prepositions require the following noun to be in the genitive case.

So:

• في = in
• الصورةِ = the picture / the image in the genitive

That is why the final vowel is -i in full pronunciation: في الصورةِ.

Grammatically, الطبيب is masculine singular.

So it usually means:

• the male doctor, or
• the doctor when gender is either male or not being specified in a generic way

If you specifically mean a female doctor, you would usually say:

• الطبيبة

And the verb would normally agree accordingly:

• تظهر الطبيبة في الصورة = The female doctor appears/is visible in the picture

It can mean any of those, depending on context.

صورة is a broad word and may be translated as:

• picture
• photo
• image
• sometimes illustration

So في الصورة can naturally mean:

• in the picture
• in the photo
• in the image

Yes, in many contexts that is a very natural English translation.

Although يظهر literally means appears / is visible, English often uses:

• The doctor is shown in the picture
• The doctor can be seen in the picture

Those translations capture the same basic idea in smoother English, depending on context.