While the dog
is a "black and white" you are going to need to make his fur using (Prisma names) some of these:
Cream, beige, peach beige, goldenrod, jasmine, beige sienna, ginger root, and some of the lighter umbers and brown-tones.
Toward the side his fur becomes cooler, so I would look at some pale blue-greys. Do not skip the darkened area of his collar (cooler) or the staining of his fur around his mouth.
is reflecting back some of the dog's warm fur hues to the left and down just past his paw to the right. Notice the difference in value between the snow and his fur: this may mean you have to delve even more deeply into related colors for some darker hues for the fur so that you can get the snow to appear lighter. Compare the entire reference photo to the white of the screen surrounding it -- there is no pure white in this photo.
You will want to save any white
you use for just the edges of highlights.
I apologize for nixing the use of greys, but it appears that because there is no direct light source evident (save in the background on a bit of the snow, where it seems to be coming from the right) you will want to explore some grays . . . I can see some cool greys (bluish) and some French greys. There will also be some light lavenders and blues in the snow.
The background will need to be kept out of focus so the dog will pop forward. Use lighter shades for the foliage than you use for his dark fur. The dark fur should contain some reddish browns and black where it goes deep. The darkest and crispest edges will be on his head, as they are in the photo.
Overall, though, the dog's furs is orange-yellow (pale) and the snow is blue-gray. That is how you will contrast the two, but it is subtle.
This photo has great potential! He is a handsome fellow. You can create a useful tool for determining and matching colors to the photo if you wish by cutting small (2"x3") pieces of white
card and punching a hole in each. Use one on the photo and one on sample swatches of color
you have made on practice paper. A grey scale will also become invaluable as you work the subtle value shifts int his image. Below I have posted the one I use the most. But you can just Google Image and find a huge variety of scales to choose from.
I might suggest some trial runs to find the colors you will be using and then re-posting them here. A few more sets of eyes can help in fine-tuning your selections. I would just do some lightly applied layers of colors, warm down one side and cool down the other, in various values, and then begin your selection.
Best of luck. Hope this has been helpful and not overwhelming. And have fun!
A couple more:
You can even punch holes in the grey scale to help you assessing the values in your photo.
Annie . . . I just looked over some of the works you have posted in W/C . . . you will do just fine. I should have looked before responding, as you handle colors, and the medium, quite nicely!