Ah yes, I can see what you mean about making them more readable. To me, the only thing that makes it a little hard to read is the main typeset. I'm not sure if it's just the size being on the tiny side or the font being quite ...narrow? Although, the headers and the colours I think are fine though.
New tutorials... mm... since it's a digital media, maybe something on monitor calibration? ...Or not. I did notice a couple of deviations of comic pages in your gallery. Maybe some tips and tricks on comic layout? These are just suggestions.