Congrats! Getting dedicated power for your shop is an exciting project. There's nothing quite like looking around an sayin', "Dang, this ROCKS!! No more extension cords running all my tools off one outlet!"
Running lights and outlets is one thing, but installing a new box, well...
I'm not a pro, but frankly your pics frighten me, friend. I have heavier-gauge, better-insulated wire running to the toaster in my kitchen, than you show running to the box that's going to supply your whole shop. There are laws and codes for this sort of thing for a reason. Mainly, so people don't burn themselves and their neighbors to a crisp.
I presume you're running power from your house to your shop. How many amps are serving the house, and how many are you running to your shop? I see a 100-amp breaker in your pics, but are you really getting 100 amps into the box safely? Did you assume that a $10 breaker will take care of all your power needs? Is your shop wired properly to deal with that kind of amperage? Is the rest of the wiring in your shop noodle-thin as shown?
Are you a licensed electrician, or did you have one run the main-line and inspect the box? Are both the box in the house, and the box in the shop, properly grounded? Do local codes require you enclose the new box in the shop? Does the enclosure have to be steel or can it be wood? Does every single outlet in your shop have the proper rating for the tools/lights you plan to run off it? Is your shop attached/part of your house, or is it seperated by "however many feet your local codes require"?
Are you certain your homeowners/renters insurance covers the shop now? Is it a hobby or a business? Any zoning requirements involved? Does your mortgage holder/landlord know about this? You might be surprised at the fine print these people have in your agreements, and how badly you can get slammed if the worst happens and you're not in compliance.
I'm not trying to be a drag, but these are things you need to deal with. This is SERIOUS BUSINESS that can destroy everything you ever worked for if you don't have it done right!! I could be completely wrong, you may know exactly what you're doing. If that's the case, I apologize sincerely. Just sayin...
Cover your butt now, it may save your butt later. No one wants to wake up (or, not wake up ever again) in a pile of ashes and find out they're being sued/fined as well. It "only" cost me $275 to have a licensed, insured professional run power to my garage and make sure it's all legit. The electric company came out and signed off on it being legal/safe for free. This is at least a start.