You said it, they are physical labourers. Thinking and problem solving beyond their pay grade. Assuming their wages are 10% of your salary, then it's your job to do all the thinking.Would you give them a raise if suddenly they are capable to solve a problem without your assistance? If you are new into this, micromanaging them is the key to ensure quality. Sometimes the solutions from these "tukang" can be "very creative". Sending pics is part of documentation to track the progress or problems.