I'm taking 4 as levels at the moment in Geography, English Language& Literature, History of Art and World Development
The workload is okay as long as you keep up (thus far)
My friend is doing photography and she says it's time consuming as a lot of practical elements are involved. If you are good with keeping up and planning ahead, then I'd go for 4 as subjects, if you dislike one then you can drop one whereas if you do 3 and dislike one, you cannot drop one because university requirements are obviously 3 full a levels. They suggest it, but go with what you feel is best! I definitely think try 4 and if it really doesn't work out in first 4-5 weeks of sixth form, drop one.