First one, if you were in the US, I'd say was a Redtip. It's a bush that does have pale cream/white flowers in the spring.
If so, the reddish leaves are fine, the yellowing ones and moss may mean the soil is too heavy/wet for it. But as you're not in the US, I'm not sure, as I'm not sure Redtips grow there.}:P

The second one, need a closer pic of the leaves to id it, sorry.

Third is a juniper, prickly things that they are. It's not happy, which means it may need repotting. The dead branches can be removed.

Fourth is a Dianthus/Sweet William. Pick off the dead flowers/stalks and it should start perking back up.