Yup, very true. I edited these on a laptop which I ought to have learned not to trust. Steve has repeatedly said shots from this are too dark and there is clearly room to brighten in the histogram. Is 1 better now?
IMO there's not too much wrong with the exposure but the contrast is way too much causing the darker areas in the image and giving a bit of a mucky feel to the tones. The shots themselves are lovely and I'd honestly start again with the processing, its definitely worth it. Just boosting the exposure as suggested above will only lift the overall image and cause other issues, mainly with the highlights which are already quite bright.