I want to do a tattoo. Are there any limitations? For example, if I want to do a tattoo of a specific sign (zodiac or anything like that) are there any limitations? Is the snake tattoo is allowed ? And can we do eyelash extension?

The sign must not represent a false belief. Of the zodiac sign indicates belief in astrology and that these signs tell the future, that’s not permissible. If in your society it doesn’t have that meaning, and it doesn’t promote any false beliefs, then it’s ok. Snake tattoo is allowed but it’s makrouh (un-recommended).