Perception of aesthetic appeal in images depends on image features and internal factors of the observer. Previous work has shown that depending on the type of images: art, architecture, faces, or landscape, etc. the inter-variation of the perception of aesthetic between participants is not equal. The evaluation of Art and architecture are found less consistent than for faces or landscape. It has been theorized that these differences of consistency between persons are due to their lack of expertise into the field of art and architecture compared to recognizing beautiful landscapes and faces. Therefore, this study analyses the rating behaviour of the participants based on their knowledge of photography. Two different types of subjective data were collected: one using social media, and the other one based on a crowdsourcing experiment. In both cases, different groups of users have been identified and differences of ratings between these groups are found. Therefore, it seems to be important to consider who is considered as a test participant in a study targeting evaluating aesthetic appeal in photography.