I really like the vibrant colouring in this and you did a really good job on the roses. The hair and the folds of the clothing are also quite good.
However, I do find that there is something awkward or off about his left arm. I think it appears to sharp. When an arm bends it is more of a curve than a sharp bend. In other words, the elbow is a bit more pointed than it should be.
The character`s face could also use some work. It looks as though his right and left side are conveying two different emotions. If he is winking with his right eye than his left eyebrow should rise up a bit more and his left eye should be open wider. This is how the muscles would work in this action.
Thank you, this is very helpful. Once I'll get the chance, i'll edit his face a bit. Also, your thoughts on the background? I changed it several times, and I'm not sure whether it fits.
I think the background looks nice. Granted this type of patterned background might have the tendency to become too overwhelming but in this case you have used a gradient method to fade the top portion and some of the areas in between...so, in my opinion, it works well.