Doodles (Take 1 and Take 2)

I've been doing more writing than drawing lately but I felt like trying to elaborate on a doodle I drew in the middle of a seminar I should have been paying attention to. Here's the second version:

And here's the first:

I mostly just managed to replicate it on paper without lines but I think I'll give it another try and add some colour. We'll see how that goes!