The 16gb SSD will be a limitation, as will only 1gb of ram, the small screen will also be a nuisance for photo work. The Asus build quality isn't that great in my opinion too.
The small netbooks are great as tiny portable field computers for reviewing work away from your normal base, but as a main machine you ought to be able to pick up a better machine with a bigger screen for very little more.
If you do want one as a highly portable machine, look at the slightly better specified ones like the Acer Aspire One, MSI wind(Advent 4211) etc. They can all be supplied with decent sized hard drives and can take more ram to make them quite usable. I've got an Advent 4211 with 2gb ram and it runs Lightroom or PS CS4 quite happily and is great for checking and reviewing work on location.