Zdejmij proszę obraz ze ściany.

Zdejmij is the imperative form of the verb zdjąć, meaning take off / remove.

In this sentence, it is a command or request addressed to one person. Polish often uses the imperative where English would say Take ... or Please take ....

A useful thing to notice is that zdjąć is a perfective verb, so zdejmij suggests a completed action: remove it rather than be removing it.

Polish usually does not need to say the subject pronoun when it is already clear from the verb form.

So zdejmij already means you take off / remove! when speaking to one person.

Adding ty would usually sound unnecessary unless you want emphasis, contrast, or emotional force.

Proszę makes the command softer and more polite. It works like please in English.

So:

• Zdejmij obraz ze ściany. = a plain command
• Zdejmij proszę obraz ze ściany. = Please take the picture off the wall.

In Polish, proszę is very flexible in word order, so you may also hear:

• Proszę, zdejmij obraz ze ściany.
• Zdejmij obraz, proszę, ze ściany.

All are natural, with slightly different rhythm or emphasis.

Obraz is the direct object of the verb zdejmij, so it is in the accusative case.

However, for many masculine inanimate nouns in Polish, the accusative singular looks exactly the same as the nominative singular.

So:

• nominative: obraz
• accusative: obraz

That is why the form does not change here.

Yes, obraz has a broad meaning. Depending on context, it can mean:

• painting
• picture
• image
• sometimes even scene or representation

In a sentence about taking something off a wall, obraz most naturally means a picture or a painting hanging there.

If you wanted a smaller or more casual picture, you might sometimes hear obrazek, but obraz is perfectly normal here.

The preposition is basically z, meaning from / off. But before some consonant clusters, Polish often uses ze instead because it is easier to pronounce.

Since ściany begins with śc-, Polish prefers:

• ze ściany

rather than:

• z ściany

So this is mostly a pronunciation-driven variant of the same preposition.

After z / ze meaning from / off, Polish normally uses the genitive case.

The noun ściana means wall. Its genitive singular is ściany.

So:

• nominative: ściana = wall
• genitive: ściany = of the wall / from the wall

That is why the sentence has ze ściany = off the wall.

Literally, it is closer to from the wall, because z / ze means from.

But in natural English, with a verb like remove or take down, we usually say off the wall.

So Polish uses:

• ze ściany = literally from the wall
• natural English translation: off the wall

This is a very common difference between the two languages.

Yes. Polish word order is more flexible than English word order.

Your sentence:

• Zdejmij proszę obraz ze ściany.

could also appear as:

• Proszę zdejmij obraz ze ściany.
• Zdejmij obraz ze ściany, proszę.
• Obraz zdejmij proszę ze ściany.
  This last one is more marked and gives extra emphasis to obraz.

The basic meaning stays the same, but the emphasis and tone can shift.

It is grammatically a command to one person, using the ordinary imperative. On its own, that often sounds like speaking to someone you know, a child, or someone in a situation where direct instructions are normal.

Because it includes proszę, it becomes more polite, but it is still not the most formal possible way to address a stranger.

More formal alternatives would be:

• Proszę zdjąć obraz ze ściany.
• Niech pan zdejmie obraz ze ściany.
• Niech pani zdejmie obraz ze ściany.

So the original sentence is polite, but not maximally formal.

The verb zdjąć is perfective, and its imperative zdejmij tells someone to carry out the action as a complete task: remove it / take it down.

The related imperfective verb is zdejmować. An imperative like zdejmuj can sound different depending on context. It may suggest:

• doing the action right now in progress
• repeated action
• instruction about the manner of doing it

In many normal commands where you want a single completed result, Polish prefers the perfective imperative:

• Zdejmij obraz ze ściany.

That is why it sounds natural here.

Not in this sentence.

• na ścianie means on the wall
• ze ściany means from/off the wall

So you could say:

• Obraz jest na ścianie. = The picture is on the wall.
• Zdejmij obraz ze ściany. = Take the picture off the wall.

The first describes location; the second describes movement away from that location.

It can be used more broadly for removing something from a surface, place, or body, depending on context.

For example, zdjąć can mean:

• take a picture off a wall
• take a lid off
• take shoes off
• take glasses off

So the core idea is remove / take off. In this sentence, because the object is obraz and the source is ze ściany, the natural English choice is take the picture down or take the picture off the wall.