I made a perhaps unusual interpretation of your question, by assuming you’re meaning to ask How would Earth look if we were living on a different planet of our solar system? (I changed my answer by assuming you meant “how would Earth look” rather than “how would we look”.) I will consider the question without the interpreted change at the end.

When you look up at the sky sometimes you can see Venus, our closest neighbor, and a planet almost the same size as Earth. To the naked eye it’s a very bright point of light in either the early morning or early evening sky.

If you were living on Mars and looked in the right direction at the right time of night and year, you would see Earth looking similar to what Venus looks to us now.

Through a large non-terrestrial telescope you could see Earth from anywhere in the solar system as long as it wasn’t behind the sun. It’s brightness would depend on what percentage of Earth was lit with sunlight relative to the observer in space, and how close to you Earth is as both you and Earth go around the sun at different speeds.

Now, let’s revisit the original question, “How would we look if we were living on a different planet of our solar system? “ and take the “how would we look” as is, without interpretation.

That brings up a whole other topic, like would we change over time if we were living on other planets so that we didn’t look exactly like humans on Earth look like now.

But I don’t want to get into that, as interesting a topic it could be, because I don’t think that’s what you were asking