I am certainly doing something wrong. In winter when there is snow on the ground my photos look "grainy", not as sharp as they should be. I'd welcome any tip or recommendations :-)
I think it's a nice wintery photo. The red chair and shovel really pop. You might need to experiment with the white balance to get a whiter white. I don't find this grainy. The snow dusted branches look a little hazy but I think that's a factor of the fine branches and the snow.
Nothing sadder than lawn furniture out in bad weather. The photo tells a story of changing seasons. I think it's well photographed, but snow is a challenge.
It doesn’t look grainy to me, sometimes I think the camera has trouble focusing on a subject when there is a lot of similar light coloured points in your focus. The camera has homed in on the red chair because it ‘sees’ it easier and that is crystal clear. If you are using auto focus change to manual and try dropping the brightness a point or two.
My magnification is too low to evaluate your image. Based on the EXIF, I think your aperture is too large. After exceeding a certain aperture value, the image quality deteriorates significantly. This can be found on the lens manufacturer's website. They provide graphs on which you can read what is the optimal aperture value. Sometimes I cross it, but that's for special effect. I hope this explanation wasn't too convoluted in my English.
The snow could be whiter.