Sprites, maps and UI for a 2d pixel game

Description

I require a graphic designer to produce a series of sprites, maps and UI for a 2d pixel game. This initial task is for a proof of concept.
3 sprite sheets to be collated. Currently the sprite movements are in separate files and would need to be in one. Additionally, not all sprite directions are available.
3 game maps to be generated. A potential obstacle would be ensuring clarity of player movement. The example I can provide will demonstrate the feel I am looking for. The challenge would be making some assets I am interested in fit. This may require modification of the assets themselves.
3 UI features to be created. This would be a text box, inventory and toolbar. Assets would also be available for this.
Ideally an artist who can work with and generate PSD files; either with GIMP or photoshop.