Topshop has now also made another one of these apps in order to promote their make up range.
Then you can select the makeup you want to try on.
After trying it out above here are my thoughts. The outputs do vary and obviously the colour in my photo is a bit off which probably didn't help much. Aside from this the placing of the eyes and lips are quite accurate. What they are missing though is the option for a really subtle look.
Although I doubt many people would buy this make up based on this app alone and rather than offering an accurate virtual makeover the purpose of the app is to make people aware of Topshop's range of make up which I think it does well. Meaning users would be more likely to go to a shop knowing what they want to try.
If you want to try it out for yourself. Click here.