Hard to pin down. Part of the issue might be that I am repeating old habits from other media instead of working from scratch with this new one's best attributes.It's a challenge, for sure. I'm glad you're keeping at it. Your "other" new colors are a good addition. The layering helps your transitions. What do you see as working, or not working?
I'm torn between looking at the upper portion vs the lower portion.
I also have acrylics, but haven't had them out for a long time, going for the gouache instead. 

Well, there's pigment in there someplace, right?Terri, there is no actual medium here. It's a waxy crayon by itself and is soluble in water. But no medium to use for that. Of course, I suspect that something like acrylic medium might work or even Ceracolor (cold water wax) medium. That's not the idea here however.
I used the term loosely as the descriptor for the crayons, just to get more of it on the paper before applying the water. Sorry for not being clear. 
Did that but surprised about how the blending appears to work sometimes, not so much others. Is it color dependent? Don't really know.Like what youve done with the fg and mountain, but as has been discussed the sky has 'issues'. Not tried neocolour II myself, but blending with water is an option.
A bit of an older post @Bartc but wondered how you got on with neocolour 2 wax crayons? I've just got some and am playing with as is and with water...Kay, it's not difficult at all. Just takes learning like every other medium that's new to you.
It sort of reminds me of using watercolor pencils or watercolor sticks. In this case it feels like and goes on like an ordinary wax crayon, but then there are all those interesting water effects you can do with them. And as you note they can make distinct marks but they can also be blended and washed too. Or do both combined.
What I think I may do wrong is try to scribble too fast, as a kid would do with an ordinary Crayola. That's when it doesn't work as well as I'd like. But when I take my time and treat it more seriously it seems to have merits. I have yet to try it as an underpainting for my pastels; that's the next experiment if I ever get around to it. Lots to learn. And any art store is a "candy shop" for me!
Actually, if you watch some of the earlier instruction videos they note that you can sharpen the crayons for more precise detailing. And I recall seeing a sharpener that had a bowl to catch the scraps, which you can use for watercoloring.Thanks @Bartc I did try just putting my wet brush on the crayon and using it with watercolor.. handy as you said too. I will try some more watercolour practice. I
I mainly like doing fairly detailed drawings so am wondering if watercolour pencils might give a bit more precision than I'm getting with these but I think they could be particularly good for skys and covering an expanse of paper when needed...