Advice on new roof please

[Mahmoud]

Good evening, 

I had a new roof installed. I am happy with appearance on the back side .However, I don't feel the same about the front side ,I feel there is something not quite right going ,I am not an expert, so I can not exactly describe what is wrong, am I over suspicious?

I would be grateful for a professional expert opinion and advice whether anything need fixing /doing before I complete last payment to the gentleman who did the work.