In general, i really like how you've displayed the 3D effects and the perspective view.
#17 really got my attention for the digital-looking design beneath the word 'digital'. i do think that the word 'digital' is a little bit lost, especially compared to #16 and #15. also, some stronger colors could make this one really pop.
Regarding #16 and 15 - very cool as well. i will say my eye keeps getting drawn to the 4 and what looks like an "F" coming out of it which is a little distracting, as is the lower 'lip' on the 3. but overall, i really like the concept here as well.
Thank you for the update - really like the new design on #40!
Could we try a version of that with less rounded edges?
I also like the stairstep look of this...is there a way to add some depth or elevate the 423 within the box (either altogether or individually)?
this comment is probably a little abstract, but every time i look at #40, MC Escher's art comes to mind - not sure how you'd incorporate that, but if you could that would/could be sweet...