aa = [{105199: 'https://picx0.jpeg'}, {105187: 'https://picx1.jpeg'}, {105170: 'https:picx2.jpeg'}, {104574: 'https://picx3.jpeg'}]

from collections import ChainMap

chain_dict={}

for i,v in enumerate(aa):

    try:

        chain_dict = {**chain_dict,**{**aa[i],**aa[i+1]}}

    except Exception as e:

        pass

print(chain_dict)