i dont know how to shade ighter

aaa I have a few tips if ya want- at least on flipanim I use a color a deeper hue (ex: shading orange would use more red, shading blue would use more indigo) and make the opacity really low. if you're looking for just some kinda basic color you can shade everything with and it would look good, I'd use a purple but sometimes its best to go with what color the background is or a color that compliments it. I personally use dark red or blue