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One other observation; those droplets of water in the sight glass, above the water line are a give-a-way that a skim is in order.

Also, concerning the venting. The damper will probably need a spill switch. This is code in my area, but wasn't included with my boiler. The manufacturer should be able to tell you which you need if you need one. Call their tech line. This shutz down the boiler in case the flue gets blocked so you don't die of co poisoning.

Yes, The Hartford loop is there and looks good too. Do investigate how the boiler and water heater flue are tied together and, if necessary, have them seperate them and vent them seperately into the chimney. other than that it looks pretty good.

Yep the bypass is very clear in that picture! Yes I think you have it. If you are curious about skimming you can search this site and find plenty of information about the process. Remember it's time consuming (think in hours). If you feel comfortable it is a very DIY friendly task. I look at it this way do you want to pay them their hourly rate to stand there and watch water flow? Also it is very likely on a new install that it will need to be done more than once. This is because it can take time for all the oils from new piping to work it's way back to the boiler.

The vent damper comes with the boiler they should have installed it. You will lose some efficiency without it. The piping looks a lot better then most of what we see around here. As near as I can tell it's at least to minimum manufacturers specs. That wiring wouldn't pass in my area romex run without support like that is a no no I have always seen it run with conduit or armored cable. Not sure what the codes are in your area on that. Looks like you have an auto feeder, is there a manual bypass for it? There should be a way to manually feed the boiler without using the auto feeder and be able to valve off the feeder. I can't really tell in those pics for sure, but it looks like the only water line goes through the feeder? Without the bypass skimming will be impossible.

Still can't see if there is a Hartford loop back behind that equalizer but most of the piping looks pretty good. The flue pipe looks like the boiler and water heater are tied together before they go into the chimney. I doubt if that meets code. I would think they should each terminate in the chimney so that neither appliance can exhaust back into the other. Should have a damper. Looks like it needs to be drained and cleaned and a skim port installed and a skimming. You may need to skim two or three more times over the next month so watch how they do that, after they put the skim port in.
Show us the Hartford loop in another picture.

Nope.. no skim port installed. If you check the install manual, you'll see that weil mclain reccommends a skim port be installed right where the jacket has the opening with the fiberglass behind it showing, underneath the pressuretrol and gauge. Looks like they just installed a plug there. Does that boiler have a vent damper? The WM EG series comes with one standard. Hope the boiler has a proper header.

Oil floats. That's probably iron. When you drain water from boiler, put it in a cup and place a magnet on the side. Does all the black stuff go to the magnet? Regardless, boiler should have been skimmed after installation. Wider pic of the boiler will tell us if there's a skim port.

This is essentially the same boiler as you have. You can see the vent damper in this picture. It is the device mounted to the draft hood with the round black actuator mounted to the side. It will also have wiring running to it. It comes with these boilers and was paid for as part of the boiler package. Not supposed to discuss price, but they aren't inexpensive so you paid for it, it should be installed. I should also add you can see the skim port installed in this photo as well. It is the large pipe on the side with the valve. I put a valve on mine, but that isn't necessary. All you really need is a pipe and a cap for when it isn't being used.