So here's quite a lot of progress on Tintin. The spotlight improved the piece amazingly and the black is looking great. The full cross stitches around the leg (and around Snowy) still show up very well even in the sea of black half-stitches, which had been my main worry.
The only thing I don't like is that now the shadow stitches look a lot lighter, but that's a pretty small complaint. There's a lot of black to fill in but it's going more quickly than I expected (though that's true of pretty much every project).