The 90's on the return aren't an issue since the PVC is already larger than the pumps discharge and it is being pushed through under pressure but the multiple 90's on the gravity overflow will be a problem since each one causes headloss. Always try to keep your overflow and straight and unrestricted as possible for best, laminar, smooth flow.
If nothing else use a single 1" or 1.5" barbed nipple, or whatever size the overflow bulkhead is, and a piece of braided reinforced or heavy wall black vinyl tubing and bend it into a gradual sweep or elbow so it falls into the sump unrestricted. Mine sweeps down in a gradual 90 degee shape over 20-24" and lays on the bottom next to my protein skimmer so its keeps detritus in suspension and the skimmer sucks it in and removes it. If that overflow bulkhead is slip I would also replace it with a thread x thread version so you can remove the PVC later for cleaning or modifications. Once you glue the PVC in you are stuck with what you have and there is no going back without cutting the bulkhead off. Looks like the return s already threaded and you are using a male adapter which is good. I see you are using a short piece of vinyl off the pump too which is very smart since it helps take the strain off the piping and pump from minor mis alignments which it appears you have. Good move!
