While this may be great (I haven't looked) the comments that appear here look really suspicious. Of the four accounts who have commented, three (cursivedgreat, darkyen, and theanirudh) were each created within a day of each other, just after Pixtr (previous app from this developer) was announced on HN [0].

The only one of those which has had any other activity then this post (theanirudh) was used to discuss Pixtr (eg [1]).

I'd be glad to be wrong on this, the comments just seemed really suspicious (all talking about how 'clean' the app is) so I had a look at the posters, and was not too surprised.

[EDIT]

A fourth account created at the same time as the others (eshwarramesh) has weighed in, also without any other contributions to HN.

[0] https://news.ycombinator.com/item?id=5791675

[1] https://news.ycombinator.com/item?id=5791929

Landscape, Street...etc.

How do you determine that?