Nice job, but there's a couple of things I don't like about it and I'll tell you why.
1/ I don't like how it's between the studs. 40 years from now the panel will need to be replaced, what if you can't find a panel that is as narrow as the one you have.
2/ The manicured lines look pretty, but again if the panel needs to be replaced what happens if your lines come up an inch short in the new panel?
This is reason #1 why I leave my wires long.
3/ I really don't like how the top lines run down to the top half of the breakers. Reason #2 why I leave my wires long is all the wires entering my panels make a loop down then back up to the breaker. The reason for this is if there was ever a leak in the house and water followed down the wires it's going to flow right into the breaker. The loop will make any water drip harmlessly into the bottom of the panel.
This is a pic of the 100amp panel in my shop, the panel in my house looks similar and is the same brand (for interchangeability of breakers) except it's a larger 200amp service.
Not as neat as yours, because every wire is long and makes the downward loop.
I installed this panel about 15 years ago, since it's in my shop all of the outlet wiring is 12/2 with 20amp breakers.
BTW I was the first reply with "Check and tighten all your terminals", although some have said it in more words.
I was taking this pic so I decided to tighten all my terminals, as I do almost every year and many were slightly loose.
