Here is my constructive criticism
Color palette is absolutely terrible ,no offense but those colors don`t even work together let alone be in the same palette
White/Orangeish/Gray .
Text doesn`t fit the signature (if it is a signature) it looks like it has been just slapped there
Has no lightning which is bad and it doesn`t add any depth
and read up on the Artistic Rule Of Thirds which might help you,I`d love to continue but my eyes hurt at this point
TL;DR
Practice more