If you look at this grainy picture, what it may be? Paper or ink issue?

Hi! My passion is to work with graphic and design, so trying my self doing business from home, offering clients personalized mugs, t-shirts etc.
Very pleased with your help to get success and sort out any issues.
Thank you

<t>Hi! I'm new to sublimation.<br/>
Using: <br/>
Ricoh Aficio SG 2100n printer<br/>
120G Subli-sharp sublimation paper (inkexpress.co.uk)<br/>
Ricoh GC-41 Refillable Ink Cartridges with Subli-Sharp Premium Gel Dye Sublimation Ink (from inkexpress.co.uk)<br/>
and I'm not happy with results at all ...