Working on block printing

I'm making a serious attempt at a linocut for the first time in years (actually decades, to be truthful).

It's based on a watercolor I did earlier this year. I really liked the stark value contrasts in the watercolor, and thought it might work as a block print, especially when I saw the painting converted into grayscale.

However, I ran into problems trying to plan the linocut (I could not make my mind work negatively using "positive" tools - black ink on white paper). So I found black sketch paper and a white charcoal pencil, and did my planning with that (at left in the image above).

So now I've started cutting the block. I hope this works out, but I'm prepared to try another one. I know I'm really, really rusty at this. After all, it was 1990 when I last was doing lino and wood cuts(!)

Wish me luck.