As mentioned the soldering leaves much to be desired. I suggest if you can find a scrap board or two practice your soldering. Good soldering is a skill developed with practice. Can we just refer to soldering as soldering and not welding?
Next I would start simple and I would eliminate the 1K resistor replacing it with a 10K resistor. Next I suggest you read this Arduino / LDR and make a circuit just like what is shown in the link. Start simple and understand what is happening. Once you have that very basic and simple circuit working and understand what is going on then move to more complex.
Ron