Hey there welcome to the site.
Please don't take this wrong but I thought this was Yoko from gurren lagann instead of Widowmaker. There are some accents of widow but seems more of a yoko fan art with some wideomaker flavors.
To be more mash up of the 2, your going to need more than just blue/purple skin. Having widow arm band thing that shoots her hook and poison mine need to be added in my opinion. They're essential to her character. I would modify the sniper to be a mix of both characters. Add widows tattoo that's on her right arm maybe. Create your on visor that's a mix of the gurren lagann glasses kamina wears with overwatch tech.
The anatomy and proportions are ok. The left arm needs to be a little longer. Possible make the right hand smaller as well. Liking the face, expression and the skin tone is fine.
Overall good start. Look forward to the next update.
Last thing I would recommend is removing the pink background. Its hard on the eyes and a bit distracting.