Why is there oil coming from the bolts on the left side of the valve cover?

What is your question?

I supposenly had the valve cover replaced. I am beginning to wonder if the job was done. I am at the mercy of the mechanic who did the work. I had a burnt oil smell come from the vents when the heater was on. How would I know if the valve cover gasket was replaced. Should I have it replaced again to be sure. Will replacing the bolts fix the oil leak?