Wildflower perennial patch

Hi all

There's a patch of grass that I allowed to grow long from when we moved in. I'd hoped that I'd get some wildflowers appearing but all I got was long grass and rye, I think. 

I now want to cut it all back to sow some yellow rattle over the winter. I'm cutting it back with shears then raking it to clear the ground. I've attached a picture of a small patch where I've started and was wondering if that was clear enough or I needed to expose more soil still? 

The ground below the grass is very wet and mossy, unsurprisingly I suppose as is not seen the sun for a couple of years!