Evaluation of Output devices
Couple of comments:
You should describe why your interface card is as it is. Not just "The traces were drawn according to the instructions of the instructor.". Description of I2C signals needed and where to connect them in ATTiny412 etc.
Include link to electronics design week where you present that you can do schematic KiCAD design should be given and now you can explain that with such a simple board it is faster to go directly to layout editor and do the design by skipping the schematic part.
Cable (with 4 cores, not three) would have been fine but manufacturing it would have been a process as well to make it single cable and not four separate wires. Reconnecting the board is much easier with the adapter card.
You also should change the code to present that you understand how the code works. Make some changes e.g. write text with delay effects or blinking text etc. Hello word is just the starting point to test that you have a working setup.
Otherwise good pictorial description of the week.