Just an update, collected my passport no issue, no question asked. Roughly took around 20+ mins

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 then try again 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

Pudu UTC

I just got my passport this week. Applied online, rejected my photo cause it didnt show my ears. Took another photo but this time i asked my wife to take bit further away. I wore dark-blue t-shirt. Collar is fine too. I just used the passport app off the play store. Same day they replied and said application lulus, they gave me a link to set collection appointment. I set it the next day at 9am at Immigresen Wangsa Maju. They asked for the application payment receipt, then gave me my number. I waited like 5 mins and it was done.

No hassle at all. Literally show payment receipt, and collect passport. 10/10 would do it online again.

For photo, just follow the below guideline and you can move/zoom when uploading it at the immi online application: