OLD
update 2
I think you did good not overcharging the image with more effects when you just started. The signature was too big so try to use a smaller size next time. The light and shadows weren't represented correctly in both images, you should probably practice more on that. Be careful with the placement of the text, it's very important when placing, don't place the text wherever you like; avoid using stylized font. The render needs to be the focal point of the image, placing it where you can't focus when looking at the image directly will make them image look less appealing and interesting.
Well, that's all I needed to say.
Have fun learning GFX.
borders
too bright
too large
bad placement for text and too big
try to put it in a place where the eyes won't go straight to
you have this massive neon blue splash that takes away from everything else
idk what the stock was but it's just overdone
you also have a lot of open space, which is filled with nothing of value
(all those random splashes of overlayed color)