i renew online with old passport picture.
made tons of tries until they finally approve my picture.

going to pick up this week or next week.
dont bother to wait email say siap or not.
after 3 days can go to the appoint place and kolek.
as for walk in. i think not all accept lo.
UTC sure can but limited number eberyday.
Office kalu.. see luck lor.

Utc u cannot walk in unless u first time or senior citizen.

dont need to walk in.
just go to the photoshop you take photos in (i assume you go to photoshop and not taking photos yourself) and ask them to align. apply and submit passport application on the spot at the shop. ask them to align until no problem submitting online.

if you take photo yourself, i cant advice much, perhaps seek online advice from forums/website.
online application took maybe 1-2 hours waiting time and BAM, you got an email ask you to go collect.

at collection center, REMEMBER to print hardcopy receipt. Bring IC, Old passport and receipt, go collection counter, wait 1-2 minutes. collect your new passport and bugger off

nonono dont feel sorry for them, passport photo rejection is a normal thing and they should be expecting it. some even ask to 'dont leave the shop' and apply at the spot.
the error i had is "there's more than 1 person/image on the picture"
she just align it left/right a bit (i was watching her screen), and resend to me. I try it again and BAM, approved. took her less than 1-2 mins.
The thing about walk in is
- ticket habis (there's limit to visitors per day)
- long waiting time
- crowded place (covid, smelly, hot, etc)
- expensive parking (da fak UTC pudu charge me RM3.60 for less than 30 mins)
try your best to do everything online.

i did mine around 8-9 am (online application)
approved with "Mohon hadir ke Pejabat Pungutan : UTC KUALA LUMPUR untuk pungutan passport."
at 10:30 am same day

Yes, I'm shocked as well.
there's actually a number/hotline to check if things got stalled.

Sebarang pertanyaan, sila hubungi 03-88926000/88926037.

this phone no. from UTC KL email
not sure the number is exclusively for that or every branch have their own number