that first one with the pig is funny but its H U G E, on the second one you should try to blend it all together a lil bit, just my advice
for sigs that come of the canvas they shoudlent be that big xD and for the first one dont border cause it borders the whole render too
Not to be critic but the first one is way too big, the background is nice and it looks cool that the render goes over the signature but its way too far. 5/10
The second one is actually fine, but you could use some more colours. And Brushes! 7/10