Aditya, let's please get something straight. Do not EVER stretch or skew your renders to make them wider or taller, it looks hideous and it ruins it. As a general rule, keep your render in the right proportions.. when you stretch Graeme Swann like that it looks stupid and wrecks the signature.
Keep working, I guess. You are still at a very amateur level in graphics but the only way you will get better is practice. Try looking at some tutorials and other people's signatures and note what looks effective.