The thing with dagobah is that for a while i was thinking about changing the planet to the one we see in ROTS (deleted scene). But then i realised something. The whole atmosphere is messing about with Luke's sensors and when he enters the atmosphere all his X-Wings controls die on him. He is out of control. Now if the cloud cover wasn't all over like is stands now why wouldn't Luke just head for a calmer area where there is no cloud? Yoda chose that planet for a reason. We see it in the ROTS deleted scene when Yoda arrives there and its got hardly any cloud cover. Now many years later we see it again and its got a turbulent atmosphere. maybe Yoda had something to do with that so he couldn't be found. I don't think that making it look more like it does in ROTS is the right way to go. Changing the planet to show more green would really make Luke look a dumb shit for heading down through a cloud covered area when he could have easily head towards the safer option.