Free Twitter Banner PSD Download for Photoshop
To help you get things across on twitter when posting an advertisement of your services, why not use a template made in Photoshop so the artwork appears correctly on all devices every time.
The will get you message over to your public and network much more effectively.
If you are going to tweet your services on twitter then make sure the advert fits the window
I have created a template for you here – there are a few options and a centre target so you know where the middle is