Okay this is my experimentation for OUIL505. I realised that my book binding skills especially coptic stitch (images above) have improved. I still remember when I did this stitch for the first time, it took me more than 2 hours for a book to bind and it looked so bad and unprofessional. However, now it takes me not more than 30 minutes and it looks really neat and excellent. I still think my book need to be tighter though.

All you need are practice and patience.