I found this from other TCOS forum and its useful .So I put it here to share with you.

You can divide the interface art into 5 different groups:

1)GUI Windows: These are all interaction windows present in the Chronicles of Spellborn Gold, for example Quest log, Friends’ list, Guild window, Skill book, Inventory window, etc.

2)Heads Up Display: These are all fixed interface elements present on your screen while playing. For example, Player Avatar window, Mini map, Body Slots, Combat bar etc.

3)Icons: All equipment, quest items, resources and consumables have icons. We need to create thousands of icons, so that players can recognize an item when browsing through the inventory or shop. Also, for example, navigating through combat (skills) and interacting with NPCs requires specific icons.

4)World maps: When navigating the Spellborn universe, a map can be very useful. All maps are divided in shard maps and those are divided in separate areas. These maps are all drawn by hand.

5)Additional GUI art: Sometimes unique interface art is needed, for examples shop interiors, loading screens, game launcher, website stuff, etc.