its a bit big imo

most sigs are like 350 x 150 but i dont really care what size you use

i dont really like the idea of having those 'c4d' or abstract renders or whatever on sigs unless its a grunge sig cuz they would blend nicely

as for fonts you would wanna use just default fonts

and if you go for pixel fonts make the size small

i'll give you a 7/10

Coloring: Pretty good you should try making it multicolored on the 2nd one

Brushing: Normal

Render: Not like

Text: Its ok

Font: Try to use a default font

But then again i'm a n00b too, but thats what i learned while im still learning just keep that in mind