Graphic design for video game

Hi. We are looking for a freelancer capable of creating several designs for our video game project. We need 32 mages of different types of terrain with isometric view of 512 px wide by variable height, something like this (image 01), looking for styles like images 02, 03, 04. Aditional images will be provided to the selected freelancer. The budget does not exceed $100 and please abstain from making any offer that can exceed it . You must be disposed to sign a contract in which you give us all the copyrights and commercial rights of the images and graphics that you will be creating for us. The deadline will be at least 15 days . Please add the words terrain design at the beginning of your offer for us to know that you have read the description of the project. We are looking for a long relationship for more work in the future. The artist must be disposed to make an example of what we asked for before being hired, so we can be sure that you understood our going. Thank you very much