Wicked Princess - Concept and Idea Development (CID)

Recently, I have been working on a project where I will create conceptual art for a potential video game. The game is based on the story of 'The Wicked Prince' by Hans Cristian Anderson and the artwork will be finished by May 3rd.
Here are the list of the assets:

Environments
-Magnificent Ship Interior
-Magnificent Church Interior
-Devastated Peasant Village Exterior
-Heavenly Exterior

Props
-Prince's Primary Weapon
-Magnificent Ship Exterior (as vehicle)
-Prince's Army's Tools of Destruction
-Statue of Prince
-Prince's Treasure Item - inanimate or dead
-1-3 x Mundane Props from Devastated Village

Characters (one non-humanoid)
-Prince/Princess Protagonist
-Numberless Angel
-Priest (impoverished or otherwise downtrodden)

I've been wanting to design something that has influences from West African culture so will use the culture/traditions/people/architecture as my main reference. However, I want this to be a fictional game world so will combine with reference from other sources too. At the moment, I have created mood boards (see below for examples) for each asset and  made some initial sketches.

Village Exterior

Priest

Wicked Princess

Princess Statue

There's a lot of free-flowing experimentation at this stage - no idea is set in stone. Below are a few of my initial thumbnail sketches (I've highlighted my favourites) for my version of the 'wicked prince'. As you can see, I've gone for a female protagonist.

Silhouette thumbnails are good for focusing on the form of the character and less on the fine details. This is a new technique for me and not what comes naturally to me, but I have given it a try in these initial drawings. Still needs improvement but I can see the benefits - a strong silhouette is a key asset for any character concept.