since its just your 3rd signature your learning very quickly. but if you want criticism i suggest to
-keep the focal a focal (the card is a bit of a distraction)
-work on flow(the c4d is good but it 'cuts through' joker)
-keep text away from corners and edges
-if it helps make your focal(joker) in between the middle and the edge so you can work on effects and other stuff'
-but its your 3rd signature and your doing very great, dont get me wrong lol