#1 - Login/Registration Screen
The main screen should show the app name and a button to login with Facebook account.
Bellow, there will be a "Registration for professionals" button/link.
#2 - Main Screen (Feed):
The Main Screen should contain the nails pictures feed. The most important informations for each photo are: which user hired and which was hired for that job. You're free to structure the information as you feel better: two avatars/usernames side by side; one above the photo, other bellow, etc. But consider the possibility of the professional or the client do not have an account (never both, after all, one of them posted it). So, how should we deal with this lack of information?
Other fields that could be on each photo are: timestamp (e.g., 1 minute ago), likes and comments count.
Each photo could also contain that 3 dots upper right menu (like Instagram).
Separated from the feed, there will be a way (floating button?) for the user post a brand new photo.
There will be 2 tab selectors on the top: Feed and Near Me. You should use icons to represent the section names.
#3 - Details Screen:
Clicking on a specific photo, the user will see more details, in addition to the photo itself: avatar/username from the client, avatar/username of the professional (alongside with the distance from the current user, and the next time available for schedule), timestamp, geographical location (opens a map when clicked), text description, polish brand used, hashtags (performs a search when clicked), likes count and comments. (the fields can be arranged in the order that make more sense to you).
The primary action of this screen is to like the photo. (Floating action button?)
There will be 3 secondary actions on this screen: give a like, post a new comment and share the picture on Whatsapp, Facebook, Email, etc.
#4 - Professional Profile Screen:
Clicking on an avatar/username of a professional, the user will see her profile screen.
Here, besides avatar/username in a greater role, there will be thumbnails of her most recent jobs (with a button to see all), average rating (5 stars), number of followers and distance from the current user.
The primary action of this screen is a schedule button.
The secondary action is to follow the user.