Mr. Fahrenheit, liking the edit you did, besides the decidedly central placement of the miners.
I think the reason a foreground juxtaposition is more visually appealing is it forces you to notice something smaller before you fully see the large giant, where a background-oriented group of miners could easily be missed. It's also a bit more dynamic as everything so far seems to be middleground, and the picture lacks depth. Again, it's a shame to scrap good art for the sake of the piece, but now you've learned something about workflow

it's a constant struggle for me to avoid detailing until I'm absolutely sure I'm sold on the composition and content of an image, because detail is what I love. But in the end, if I'm careful with where and how I place objects in my picture, it ends up looking much better than if I go ahead with detail before I'm really sure what I want in the photo.
My advice to you is to make a brave choice and do something similar as Mr. Fahrenheit, perhaps a bit less drastic- to be seen in the bottom left corner, perhaps. But visually I think it's helpful if the platform the miners would be on interrupts the giant in some way.
Whether you choose to stick with the miner idea or not, I think your image, although looking nice, lacks depth. And I believe you need some foreground and deep background presence to give the viewer a better sense of scale. Miners in the foreground is just one way of doing that.