This is cute and all, but you can't really call it "your" Marshal drawing when you copied the entire pose, expression, style, everything from JustDuet. Same with the Skye drawing you posted.
Maybe try to be more original? c: You have potential!
It looks fine but it definitely looks like you were looking at an exact picture and basically copying it down. In my opinion, drawing should be creative and you should be able to create something unique that makes people think that you have something in you that just gives a creative spark to others as well.