I don’t really see movie Snape and Harry, though I have a couple of lovely icons with Alan and Dan as the characters.
My favourite artists have to be veridian_dair and yukipon both their Snapes, though obviously handsomer than JK Rowling’s vision, are definitely more how I picture him, perhaps its the overly romantic in me. Jo obviously has a distorted view of Severus seeing as we see him through Harry’s eyes and teenagers aren’t known for being diplomatic.
As for yukipon one of my favourites is For Potions Master Only, it's such a cheeky thing for either Harry or a very possessive thing if it was Severus to have done. You can find a lot of their work here Yukipon on Walking the Plank. This artist draws mostly chan Harry, but I really like how I get the feeling of protectiveness in the scenes with Harry and Severus.
There are obviously other pieces of work and artists I love, accioslash comes to mind, I love the humour in her work and oldenuf2nb has drawn some lovely snarry scenes too.