Answer: the main effect of these different choices on the paintings is to show Napoleon as a man capable of everything.
Step-by-step explanation:
Bonaparte Crossing the Alps was one the five paintings first made by David in 1800, requested for the King of Spain as a gift to Napoleon and in which the intention is to make him look like a hero conquering a path that Austrian thought it would be impossible to cross and for which he took the fastest way (Gran San Bernardo) to conquer Italy again. David painted him like a hero with an elegant uniform and cape on a fierce horse mastering the path with his will, here the landscape is a scenario, not a subject.
On the other hand, Paul Delaroche in 1848-1850 made a more realistic painting of Napoleon crossing the Alps, a style that was emerging at that time. Delaroche portrayed him as a common man with cold wearing a grey coat crossing the path on a mule, exhausted from the journey. He tried to portray him as an ordinary man that was suffering even in his most daring feats to make him look more admirable.