night shots, try under-expose by 2/3 to 1 stop.
that should bring out some detail in the lanterns.

because the lantern is overexposed already. details of the lantern all washed out.

you are trying to capture the firework and lantern together?

the lantern is too overexposed, and the middle part already become white color

try spot metering on lantern, point at somewhere between the edge and the center then underexpose by 1 stop, that should be good

my first time trying on light painting, kinda failed because not dark enough

His photo really inspiring. Click spoiler to check it

I'm sure you see this 'merchantproduct' at FTZ. If you've been following FTZ long enough, you'll know that this is a trap. No phone number given, no location etc. Did you notice the way the so-called merchant typed the price? 3,500 RM. Soooo not Malaysian. If it is too good to be true, it is.

If you have some free time, just play along by shooting him an email and see his respond. Highly likely that he'll hesitate to COD and asked you to bank in the money instead.