This signature is a bunch of stock images and the bkg is also a stock image. In terms of graphics, this signature has low profile and skills tbh.
I noticed that you always use random brushing which it seems that it always gives a negative impact to the signature in general.
Try not to overlap too many things and always keep your graphics well oriented (hence the edges of the outlined shape is distorted.
Obama's right picture is out of place, if you were trying to put him in a photo border thing, was placed wrongly imo.
Im not going to comment on all of your other signatures as I looked at them all and you have the same problem on all of them. So my feedback is mentioned in the previous sentences, try to apply those thoughts on your future work.