I think you really need to find someone who fixies iMac logic boards as your soldering skills need some work ;-{
The component you put back on is not well placed (very close or straddling the other pads) and the solder looks uneven (cold solder joint)
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I also see a third component location that may be missing a part as well.
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I also see a third component location that may be missing a part as well. More likely you knocked off a capacitor without a schematic and board views to reference its a crapshoot on what’s needed here.
I think you really need to find someone who fixies iMac logic boards as your soldering skills need some work ;-{
The component you put back on is not well placed (very close or straddling the other pads) and the solder looks uneven (cold solder joint)
I also see a third component location that may be missing a part as well.