The art itself that i would like would be that of a sketch style (refer to attached file. Background would preferably be plain white). This is mostly for my own home brew work that would be later posted on the DMG with little chance of monetary gain.
That being said i would be willing to pay artists regardless if the rates are not absurd.
Dead line wise there is none although the quicker the better. I understand art takes time as well so hence the leniency.