There are many slokas in Vyas Mahabharat describing appearance of Karna. Here are a few of them. The Sanskrit slokas are translated in Bengali by Sri Sukhomoy Bhattacharya [He was a researcher and professor of Vishva Bharati University and was very close to Rabindranath Tagore]. I am translating it in English.
I have the Sanskrit slokas but IF is not letting me post it. Whenever I try to post it IF is showing "We noticed that your post contains invalid word(s). Please correct it and post again". So I'm giving the numbers of the slokas.. 😃
|Ka 94|33, | Va 307|19, | Adi 136|4,5, | Ka 72|27| Ka34|157, | Sha 1/42
Vasusena's physic radiance like bright gold or burning gold. His body reflected the brightness of fire and sun. He had lotus like beautiful big eyes. Wide forehead and gorgeous hair made him look extremely beautiful. Sun like resplendence, Moon like gentleness and Fire like luster along with tall magnificent physic, Lion like velour, large chest, broad shouldered, proud, awfully valiant Vasusena is really heroic handsome. His body was equal to Astaratni means equal to seven hands. Vasusena's feet resembled with kunti's.