You mean to CREATE artwork that LOOKS similar to other artwork??we should just check if it is legal
As long as it is CREATED from scratch and not using any gfx files from other ppl. its just fine.
If creatinig artwork that looks similar to others would be a problem, many companies would have to change their logos (because they are not unique), GUI of applications and other promotional material (you know that the Windows GUI was also "inspired" by the GUI of an other OS? like Vista's Areo Glass is too).
Never noticed all the similarities out there in artwork/software/GUI of differnet companies?