Need help on engine coolant check

[Nahid]

I am not a car expert so pardon my novice question. I want to properly check engine coolant (locally called radiator water here in Bangladesh). A local mechanic is telling me that my car needs to be added engine coolant. I have checked the user manual and it suggests that I need to check engine coolant reservoir to check if it needs more fluid. On the whitish reservoir box the pink fluid is above 'full' mark but if I open the radiator cap than the pink fluid is not visible. Should I top up engine coolant?

[CTScott]

The fluid will never be up to the cap when cold, but should be visible in the neck when you open the cap.

[Lafiro]

I thought mine was leaking because it was below the low mark when checked end of last year. I purchased antifreeze from Toyota and I filled it. Now its above the full line.
Would that cause any issues?