As you replaced the render you had used in the first sig with a completely new one it won't look great. Smudging helps with blending because it keeps the same variety of colors that the render has. As the car has different colors compared to 'Elswood' it won't blend well. Use a soft brush as an eraser and softly erase the edges of the render, this also helps with blending the render in. Also for the Elswood signature, hold shift and drag a corner (you should know that by now) to resize it and also keeping the render intact and not stretched out. Make it bigger, to take up the center of the signature. You want to keep the render in the middle to make it the "center of attention". Make the text just a little bit smaller and move it out of the way. Possibly tamper with (change blending mode, opacity percentages, fill percentages, etc.) some photo filters, gradient maps, and brightness and contrast settings as well. If you need some help with Smudging Lunethz (Oracia) is good with it, as you can see in SuperWaffle's signature
Any other GFX Designers feel free to correct me.
