It took me a couple of moments to work out what each of the components of the bomb was, but it looks interesting.
My only problem with it is that it looks like the Nokia phone is one of those old original mobile phones, the ones that were like 1 foot long, and had a suitcase for the battery and all that.
But, Blocklands scale for bricks, and how the brick-grid can't be changed does prevent lots of detail in small places.
I think maybe I'd have gone for a flat vertical print brick, 2 bricks tall, with a custom mobile phone print on it.
It looks nice, and is interesting and unusual.
I can imagine having a couple of these hidden in a build, and someone curiously coming over to check it out, not realising until it's too late what it is.
And I don't think it matters how you've designed it.
It's not like C4 would be impossible to come by for the Taliban, nor that they would avoid using it if they had it.
And an IED is an Improvised bomb. If you have some C4 and a phone and triggers, then you could improvise a bomb out of it.
Also, you should take a picture of it exploding from a distance.
The first picture is kind of just a big flash of brown with some specks of fire. :P