I've noticed that when I view images, including my own art, on any mac product, the contrast looks extremely high, and what on my screen are dark colours are on macs just huge blocks of pure black.

On my Dad's desktop mac, I can barely see my picture of Guillem  displayed in my profile. We first noticed on ebay when all black clothes and items were kind of splodgy. It's the same for images shown to me on iphones though, which look much more high in contrast than when I look on my own screen. The same goes for my android phone, which also shows images in much higher contrast.

This is a bit of a worry, since doesn't that just mean some of you are seeing the stuff I draw as hardly anything like it is? Images I have that are ALREADY high in contrast from editing, example: [link]
I included the 2 originals, 2 high contrast images for comparison (so if you're using a low-contrast screen to view these images, that's more or less the difference when I put them onto a mac pc or most smartphones/iphones), and the 2 at the bottom have been brightened, so that anyone using a high contrast screen can compare. There's more detail in the comments, but if you have time do let me know. I'm always worried that when I use dark colours, half of you are just going to see blobs with no detail, or when I draw pale skin you're just going to see contourless white masses.

Basically, do the originals display as ok on your screen, or is it just way too dark for you to view? If you do have a dark or high contrast screen, do the brightened ones show way more detail that on the originals just showed up as black areas / areas too dark to see detail?

Thanks for helping me out if you have time