The bottom of the app will have a 5 item tab bar, from left to right being - Discover, Following, Sell (This tab should be emphasized by being bigger, or having a rounded top, the icon for it should be a storefront or something like that), Top Stores, My Profile.
The heading bar of the app should be have a search icon in the top right at all times, that when clicked overlays a search entry. The center should show a somo logo on the discover page, the rest of the pages should show the title of the page here. To the left is an icon with 3 bars that when tapped slides out a menu from the left of the page, see the "Slider" sketch.
Screen 1 - Discover Section
This section should be similar to the "Featured" tab from the iOS app store. At the top, is a left / right slider for promo images, below it are sliders similar to the "Best New Apps" slider in the app store app. These are for things like "Trending Store", "New & Noteworthy Stores", etc. Feel free to get creative for the rest of it!
Screen 2 - Sell Product
This section will pop up from the bottom when the "Sell" tab item is pressed. Reference the "Sell" sketch for a visual idea. The top 1/3 to 1/2 portion will be a camera view that users can quickly snap pictures of their item, each picture snapped will overlay the camera view with a small square thumbnail of the shot taken, that can be removed by pressing a little X circle in the top right of each thumbnail. Below this are fields for Product Title, Description, Price, Quantity, a Toggler item for enabling or disabling Free Shipping, a supported carriers section for toggling what shipping carriers you will ship the item by. Feel free to get creative.
Screen 3 - Top Stores
Reference the top stores sketch. This should be a scrollable page that has left and right scroll items styled the same as the "New & Noteworthy" and "Best Stores" scrollers from the Discover page, each item should have the text name of the store below it, with the icon being high quality icon that represents what the store is.
Screen 4 - My ProfileeReference the My Profile sketch. The store's icon should be in the top left, to the right of the icon is a section that shows how many followers and how many users you are following, to the right of that is a follow button to follow a store. Below the following, followers, and follow button will be a section to show the store's reviews, represented by stars and a link text to the right to see the reviews in more depth. Below this will be the stores description. After that, we want to have a toggler to switch between the items the store is selling, and items a store has liked. Below should be a 3 column grid view displaying products / liked products. Each of these items should have a price in the lower right corner and a heart to like the item in the lower left.
Slider - Reference the slider sketch. This slide out slider should have an icon in the top that shows which user is logged in, along with their username to the right. Below is menu items, the first is "Categories" which when tapped will slide out another menu to the right of this slide out that lists the categories. Below that will be Orders, Likes and other menu items - feel free to use filler text for the time being for these additional items. At the very bottom the items Settings and Sign Out should be locked