Was compost or fertilizer put in the planting hole?
Is the root crown buried with soil or mulch?
Excess water, especially during cold weather, as you indicated, can produce those symptoms in the second and third photos, especially if the above problems occurred.
A month after planting is the normal time to fertilize. Look for fertilizer that has 10% or so of Sulfur, 1 or 2 % of Iron, similar amount of Manganese, 1/2% or better of Zinc. The micronutrients can be less if chelated or Wolftrax.