So it is about 12,000 pixels wide... so it probably looks similar in terms of dimensions on an old iPad. It is just crisper on the new retina one.

Btw, when you pinch you can zoom even beyond 100% (releasing it, zooms it back to 100%) and you can see the "brush strokes" but there's no JPEG compression artifacts from what I can tell.

I started examining your mountain technique and I must say the peninsulas look very realistic with their mountain chains. Aspiring mapmakers can learn quite a bit from this map.