Allright so this tuned into a bit on an essay.
Let's start from the composition, you did it the same way as the reference so that's a triangle composition that usually guides the eye to the top and center of the image which is good here since that's the point of interest. But yours is a bit unbalanced, the reference has a flowing scarf on one side and text on the other giving it a more balanced look, while yours is barren on one side and the other is crammed with text that doesn't really fit.
As for the design, you changed the character, and made it your own which shows your creativity. I just find some of the choices a bit strange, the glasses don't read well for me, the hair as well I don't even know if it is hair it could be a head scarf especially since it's the same colour as the outfit. Also I see you added the little anime symbol for being angry or upset but the rest of the drawing doesn't reflect that in the posture or face expression so there's a disconnect there. I assume you're trying to depict a guy that's pissed off that he got caught and has to give a blow job but he looks expressionless and bored so that could be worked on.
What are you using to draw? Mouse, intuos, cintiq? Photoshop, Krita, Corel...? I'm asking because you lines are pretty shaky. I'm assuming you're using an intouos so if it's just because you're still getting used to it that's ok, they'll get better as you practice, but they could also be improved by picking a better brush.
I don't have much to say about the colouring, it's simple and good, don't be afraid to add more highlights and contours they give the drawing depth. You picked a suitable colour scheme, the pink and deep red complement eachother well in my opinion, the only objection I have it with the hair/scarf, it's a good choice to have it match the outfit if it's a scarf, not as good for hair