Fragile Oak and Fern

It is really cold and frosty. I went for a walk and under the giant oak tree I saw all the oak leaves pale and flattened, thin and fragile in shades of creamy yellow ochre. Some of them so thin and fragile they remind me of tissue paper. The fern is the colour of raw umber, stands alone in the empty banks of the hedgerow.
This year I only found a single acorn under this giant tree. I was puzzled as I always find them here each year. Maybe when I went searching I was too late, Or, as my husband suggested, Did the squirrels collect them all early because they knew it was going to be a cold winter. I don't have the answer, but it is certainly very, very cold and the snow is here.
Anyway this little drawing was done from specimens I collected last year. The many different interesting shaped acorns, their little cups, some oak leaves and a little fragile piece of Fern.
I have used my Derwent coloured pencils, colour soft or artist. The colours remind me of this time of year and a walk on a frosty day.